Finding the Fourth Proportional to 15,501.69, 21,391.88 and 8,787.93

Step by Step Solution

1. Step 1: Write the proportion equation
   15,501.69 : 21,391.88 = 8,787.93 : x
2. Step 2: Convert to fraction form
   15,501.69/21,391.88 = 8,787.93/x
3. Step 3: Cross multiply
   15,501.69x = 21,391.88 × 8,787.93
4. Step 4: Simplify right side
   15,501.69x = 187,990,300.07
5. Step 5: Solve for x
   x = 187,990,300.07/15,501.69
6. Step 6: Final answer
   x = 12,127.08