Finding the Fourth Proportional to 15,501.62, 21,390.77 and 8,787.83

Step by Step Solution

1. Step 1: Write the proportion equation
   15,501.62 : 21,390.77 = 8,787.83 : x
2. Step 2: Convert to fraction form
   15,501.62/21,390.77 = 8,787.83/x
3. Step 3: Cross multiply
   15,501.62x = 21,390.77 × 8,787.83
4. Step 4: Simplify right side
   15,501.62x = 187,978,365.34
5. Step 5: Solve for x
   x = 187,978,365.34/15,501.62
6. Step 6: Final answer
   x = 12,126.37