Finding the Fourth Proportional to 123,815.89, 170,938.86 and 75,436.08

Step by Step Solution

1. Step 1: Write the proportion equation
   123,815.89 : 170,938.86 = 75,436.08 : x
2. Step 2: Convert to fraction form
   123,815.89/170,938.86 = 75,436.08/x
3. Step 3: Cross multiply
   123,815.89x = 170,938.86 × 75,436.08
4. Step 4: Simplify right side
   123,815.89x = 12,894,956,594.16
5. Step 5: Solve for x
   x = 12,894,956,594.16/123,815.89
6. Step 6: Final answer
   x = 104,146.22