Finding the Fourth Proportional to 13,157.02, 18,155.90 and 7,187.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,157.02 : 18,155.90 = 7,187.50 : x
2. Step 2: Convert to fraction form
   13,157.02/18,155.90 = 7,187.50/x
3. Step 3: Cross multiply
   13,157.02x = 18,155.90 × 7,187.50
4. Step 4: Simplify right side
   13,157.02x = 130,495,404.53
5. Step 5: Solve for x
   x = 130,495,404.53/13,157.02
6. Step 6: Final answer
   x = 9,918.31