Finding the Fourth Proportional to 155,879.52, 215,100.72 and 87,913.20

Step by Step Solution

1. Step 1: Write the proportion equation
   155,879.52 : 215,100.72 = 87,913.20 : x
2. Step 2: Convert to fraction form
   155,879.52/215,100.72 = 87,913.20/x
3. Step 3: Cross multiply
   155,879.52x = 215,100.72 × 87,913.20
4. Step 4: Simplify right side
   155,879.52x = 18,910,192,617.50
5. Step 5: Solve for x
   x = 18,910,192,617.50/155,879.52
6. Step 6: Final answer
   x = 121,312.87