Finding the Fourth Proportional to 21,021,405,128.56, 31,532,189,499.30 and 5,085,716,028.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,021,405,128.56 : 31,532,189,499.30 = 5,085,716,028.29 : x
2. Step 2: Convert to fraction form
   21,021,405,128.56/31,532,189,499.30 = 5,085,716,028.29/x
3. Step 3: Cross multiply
   21,021,405,128.56x = 31,532,189,499.30 × 5,085,716,028.29
4. Step 4: Simplify right side
   21,021,405,128.56x = 160,363,761,543,667,646,464
5. Step 5: Solve for x
   x = 160,363,761,543,667,646,464/21,021,405,128.56
6. Step 6: Final answer
   x = 7,628,593,833.90