Finding the Fourth Proportional to 10,781.56, 16,142.34 and 5,505.18

Step by Step Solution

1. Step 1: Write the proportion equation
   10,781.56 : 16,142.34 = 5,505.18 : x
2. Step 2: Convert to fraction form
   10,781.56/16,142.34 = 5,505.18/x
3. Step 3: Cross multiply
   10,781.56x = 16,142.34 × 5,505.18
4. Step 4: Simplify right side
   10,781.56x = 88,866,487.32
5. Step 5: Solve for x
   x = 88,866,487.32/10,781.56
6. Step 6: Final answer
   x = 8,242.45