Finding the Fourth Proportional to 139,285.32, 192,225.69 and 78,866.61

Step by Step Solution

1. Step 1: Write the proportion equation
   139,285.32 : 192,225.69 = 78,866.61 : x
2. Step 2: Convert to fraction form
   139,285.32/192,225.69 = 78,866.61/x
3. Step 3: Cross multiply
   139,285.32x = 192,225.69 × 78,866.61
4. Step 4: Simplify right side
   139,285.32x = 15,160,188,525.21
5. Step 5: Solve for x
   x = 15,160,188,525.21/139,285.32
6. Step 6: Final answer
   x = 108,842.69