Finding the Fourth Proportional to 131,863.34, 181,974.80 and 78,139.69

Step by Step Solution

1. Step 1: Write the proportion equation
   131,863.34 : 181,974.80 = 78,139.69 : x
2. Step 2: Convert to fraction form
   131,863.34/181,974.80 = 78,139.69/x
3. Step 3: Cross multiply
   131,863.34x = 181,974.80 × 78,139.69
4. Step 4: Simplify right side
   131,863.34x = 14,219,454,200.22
5. Step 5: Solve for x
   x = 14,219,454,200.22/131,863.34
6. Step 6: Final answer
   x = 107,834.78