Finding the Fourth Proportional to 21,062,172, 31,593,258 and 5,105,820

Step by Step Solution

1. Step 1: Write the proportion equation
   21,062,172 : 31,593,258 = 5,105,820 : x
2. Step 2: Convert to fraction form
   21,062,172/31,593,258 = 5,105,820/x
3. Step 3: Cross multiply
   21,062,172x = 31,593,258 × 5,105,820
4. Step 4: Simplify right side
   21,062,172x = 161,309,488,561,560
5. Step 5: Solve for x
   x = 161,309,488,561,560/21,062,172
6. Step 6: Final answer
   x = 7,658,730