Finding the Fourth Proportional to 123,694.30, 170,716.46 and 78,376.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123,694.30 : 170,716.46 = 78,376.50 : x
2. Step 2: Convert to fraction form
   123,694.30/170,716.46 = 78,376.50/x
3. Step 3: Cross multiply
   123,694.30x = 170,716.46 × 78,376.50
4. Step 4: Simplify right side
   123,694.30x = 13,380,158,627.19
5. Step 5: Solve for x
   x = 13,380,158,627.19/123,694.30
6. Step 6: Final answer
   x = 108,171.18