Finding the Fourth Proportional to 156,171.30, 215,879.58 and 139,342.32

Step by Step Solution

1. Step 1: Write the proportion equation
   156,171.30 : 215,879.58 = 139,342.32 : x
2. Step 2: Convert to fraction form
   156,171.30/215,879.58 = 139,342.32/x
3. Step 3: Cross multiply
   156,171.30x = 215,879.58 × 139,342.32
4. Step 4: Simplify right side
   156,171.30x = 30,081,161,517.83
5. Step 5: Solve for x
   x = 30,081,161,517.83/156,171.30
6. Step 6: Final answer
   x = 192,616.45