Finding the Fourth Proportional to 139,140.72, 192,014.27 and 78,710.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139,140.72 : 192,014.27 = 78,710.09 : x
2. Step 2: Convert to fraction form
   139,140.72/192,014.27 = 78,710.09/x
3. Step 3: Cross multiply
   139,140.72x = 192,014.27 × 78,710.09
4. Step 4: Simplify right side
   139,140.72x = 15,113,459,599.40
5. Step 5: Solve for x
   x = 15,113,459,599.40/139,140.72
6. Step 6: Final answer
   x = 108,619.96