Finding the Fourth Proportional to 15,498.05, 21,385.59 and 8,783.55

Step by Step Solution

1. Step 1: Write the proportion equation
   15,498.05 : 21,385.59 = 8,783.55 : x
2. Step 2: Convert to fraction form
   15,498.05/21,385.59 = 8,783.55/x
3. Step 3: Cross multiply
   15,498.05x = 21,385.59 × 8,783.55
4. Step 4: Simplify right side
   15,498.05x = 187,841,399.04
5. Step 5: Solve for x
   x = 187,841,399.04/15,498.05
6. Step 6: Final answer
   x = 12,120.33