Finding the Fourth Proportional to 15,664,671.96, 21,617,619.72 and 8,789,662.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,664,671.96 : 21,617,619.72 = 8,789,662.50 : x
2. Step 2: Convert to fraction form
   15,664,671.96/21,617,619.72 = 8,789,662.50/x
3. Step 3: Cross multiply
   15,664,671.96x = 21,617,619.72 × 8,789,662.50
4. Step 4: Simplify right side
   15,664,671.96x = 190,011,581,392,144.50
5. Step 5: Solve for x
   x = 190,011,581,392,144.50/15,664,671.96
6. Step 6: Final answer
   x = 12,129,943.22