Finding the Fourth Proportional to 15,762.59, 21,752.42 and 8,688.86

Step by Step Solution

1. Step 1: Write the proportion equation
   15,762.59 : 21,752.42 = 8,688.86 : x
2. Step 2: Convert to fraction form
   15,762.59/21,752.42 = 8,688.86/x
3. Step 3: Cross multiply
   15,762.59x = 21,752.42 × 8,688.86
4. Step 4: Simplify right side
   15,762.59x = 189,003,579.83
5. Step 5: Solve for x
   x = 189,003,579.83/15,762.59
6. Step 6: Final answer
   x = 11,990.65