Finding the Fourth Proportional to 10,542.18, 15,815.55 and 5,611.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,542.18 : 15,815.55 = 5,611.10 : x
2. Step 2: Convert to fraction form
   10,542.18/15,815.55 = 5,611.10/x
3. Step 3: Cross multiply
   10,542.18x = 15,815.55 × 5,611.10
4. Step 4: Simplify right side
   10,542.18x = 88,742,553.53
5. Step 5: Solve for x
   x = 88,742,553.53/10,542.18
6. Step 6: Final answer
   x = 8,417.86