Finding the Fourth Proportional to 139,139.01, 192,011.89 and 78,708.36

Step by Step Solution

1. Step 1: Write the proportion equation
   139,139.01 : 192,011.89 = 78,708.36 : x
2. Step 2: Convert to fraction form
   139,139.01/192,011.89 = 78,708.36/x
3. Step 3: Cross multiply
   139,139.01x = 192,011.89 × 78,708.36
4. Step 4: Simplify right side
   139,139.01x = 15,112,941,584.60
5. Step 5: Solve for x
   x = 15,112,941,584.60/139,139.01
6. Step 6: Final answer
   x = 108,617.58