Finding the Fourth Proportional to 13,155.97, 18,155.30 and 7,187.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,155.97 : 18,155.30 = 7,187.74 : x
2. Step 2: Convert to fraction form
   13,155.97/18,155.30 = 7,187.74/x
3. Step 3: Cross multiply
   13,155.97x = 18,155.30 × 7,187.74
4. Step 4: Simplify right side
   13,155.97x = 130,495,576.02
5. Step 5: Solve for x
   x = 130,495,576.02/13,155.97
6. Step 6: Final answer
   x = 9,919.11