Finding the Fourth Proportional to 123,548.94, 170,515.80 and 78,231.15

Step by Step Solution

1. Step 1: Write the proportion equation
   123,548.94 : 170,515.80 = 78,231.15 : x
2. Step 2: Convert to fraction form
   123,548.94/170,515.80 = 78,231.15/x
3. Step 3: Cross multiply
   123,548.94x = 170,515.80 × 78,231.15
4. Step 4: Simplify right side
   123,548.94x = 13,339,647,127.17
5. Step 5: Solve for x
   x = 13,339,647,127.17/123,548.94
6. Step 6: Final answer
   x = 107,970.55