Finding the Fourth Proportional to 139,156.59, 192,036.18 and 78,726

Step by Step Solution

1. Step 1: Write the proportion equation
   139,156.59 : 192,036.18 = 78,726 : x
2. Step 2: Convert to fraction form
   139,156.59/192,036.18 = 78,726/x
3. Step 3: Cross multiply
   139,156.59x = 192,036.18 × 78,726
4. Step 4: Simplify right side
   139,156.59x = 15,118,240,306.68
5. Step 5: Solve for x
   x = 15,118,240,306.68/139,156.59
6. Step 6: Final answer
   x = 108,641.93