Finding the Fourth Proportional to 21,658,824.72, 29,888,321.58 and 12,951,809.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,658,824.72 : 29,888,321.58 = 12,951,809.10 : x
2. Step 2: Convert to fraction form
   21,658,824.72/29,888,321.58 = 12,951,809.10/x
3. Step 3: Cross multiply
   21,658,824.72x = 29,888,321.58 × 12,951,809.10
4. Step 4: Simplify right side
   21,658,824.72x = 387,107,835,423,570.31
5. Step 5: Solve for x
   x = 387,107,835,423,570.31/21,658,824.72
6. Step 6: Final answer
   x = 17,872,984.36