Finding the Fourth Proportional to 139,070.54, 191,929.22 and 78,651.92

Step by Step Solution

1. Step 1: Write the proportion equation
   139,070.54 : 191,929.22 = 78,651.92 : x
2. Step 2: Convert to fraction form
   139,070.54/191,929.22 = 78,651.92/x
3. Step 3: Cross multiply
   139,070.54x = 191,929.22 × 78,651.92
4. Step 4: Simplify right side
   139,070.54x = 15,095,601,657.10
5. Step 5: Solve for x
   x = 15,095,601,657.10/139,070.54
6. Step 6: Final answer
   x = 108,546.37