Finding the Fourth Proportional to 139,422.91, 192,388.00 and 78,980.61

Step by Step Solution

1. Step 1: Write the proportion equation
   139,422.91 : 192,388.00 = 78,980.61 : x
2. Step 2: Convert to fraction form
   139,422.91/192,388.00 = 78,980.61/x
3. Step 3: Cross multiply
   139,422.91x = 192,388.00 × 78,980.61
4. Step 4: Simplify right side
   139,422.91x = 15,194,921,201.78
5. Step 5: Solve for x
   x = 15,194,921,201.78/139,422.91
6. Step 6: Final answer
   x = 108,984.39