Finding the Fourth Proportional to 139,140.90, 192,014.51 and 78,710.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139,140.90 : 192,014.51 = 78,710.25 : x
2. Step 2: Convert to fraction form
   139,140.90/192,014.51 = 78,710.25/x
3. Step 3: Cross multiply
   139,140.90x = 192,014.51 × 78,710.25
4. Step 4: Simplify right side
   139,140.90x = 15,113,510,085.73
5. Step 5: Solve for x
   x = 15,113,510,085.73/139,140.90
6. Step 6: Final answer
   x = 108,620.18