Finding the Fourth Proportional to 123,898.86, 170,964.07 and 78,496.74

Step by Step Solution

1. Step 1: Write the proportion equation
   123,898.86 : 170,964.07 = 78,496.74 : x
2. Step 2: Convert to fraction form
   123,898.86/170,964.07 = 78,496.74/x
3. Step 3: Cross multiply
   123,898.86x = 170,964.07 × 78,496.74
4. Step 4: Simplify right side
   123,898.86x = 13,420,121,955.89
5. Step 5: Solve for x
   x = 13,420,121,955.89/123,898.86
6. Step 6: Final answer
   x = 108,315.14