Finding the Fourth Proportional to 13,155.82, 18,155.50 and 7,187.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,155.82 : 18,155.50 = 7,187.86 : x
2. Step 2: Convert to fraction form
   13,155.82/18,155.50 = 7,187.86/x
3. Step 3: Cross multiply
   13,155.82x = 18,155.50 × 7,187.86
4. Step 4: Simplify right side
   13,155.82x = 130,499,192.23
5. Step 5: Solve for x
   x = 130,499,192.23/13,155.82
6. Step 6: Final answer
   x = 9,919.50