Finding the Fourth Proportional to 139,441.83, 192,405.96 and 78,999.99

Step by Step Solution

1. Step 1: Write the proportion equation
   139,441.83 : 192,405.96 = 78,999.99 : x
2. Step 2: Convert to fraction form
   139,441.83/192,405.96 = 78,999.99/x
3. Step 3: Cross multiply
   139,441.83x = 192,405.96 × 78,999.99
4. Step 4: Simplify right side
   139,441.83x = 15,200,068,915.94
5. Step 5: Solve for x
   x = 15,200,068,915.94/139,441.83
6. Step 6: Final answer
   x = 109,006.52