Finding the Fourth Proportional to 21,499,122.82, 29,688,506.04 and 13,661,218.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,499,122.82 : 29,688,506.04 = 13,661,218.30 : x
2. Step 2: Convert to fraction form
   21,499,122.82/29,688,506.04 = 13,661,218.30/x
3. Step 3: Cross multiply
   21,499,122.82x = 29,688,506.04 × 13,661,218.30
4. Step 4: Simplify right side
   21,499,122.82x = 405,581,162,013,308.56
5. Step 5: Solve for x
   x = 405,581,162,013,308.56/21,499,122.82
6. Step 6: Final answer
   x = 18,865,009.77