Finding the Fourth Proportional to 123,521.86, 170,397.30 and 78,123.52

Step by Step Solution

1. Step 1: Write the proportion equation
   123,521.86 : 170,397.30 = 78,123.52 : x
2. Step 2: Convert to fraction form
   123,521.86/170,397.30 = 78,123.52/x
3. Step 3: Cross multiply
   123,521.86x = 170,397.30 × 78,123.52
4. Step 4: Simplify right side
   123,521.86x = 13,312,036,874.50
5. Step 5: Solve for x
   x = 13,312,036,874.50/123,521.86
6. Step 6: Final answer
   x = 107,770.70