Finding the Fourth Proportional to 123,923.76, 171,068.81 and 78,671.31

Step by Step Solution

1. Step 1: Write the proportion equation
   123,923.76 : 171,068.81 = 78,671.31 : x
2. Step 2: Convert to fraction form
   123,923.76/171,068.81 = 78,671.31/x
3. Step 3: Cross multiply
   123,923.76x = 171,068.81 × 78,671.31
4. Step 4: Simplify right side
   123,923.76x = 13,458,206,989.48
5. Step 5: Solve for x
   x = 13,458,206,989.48/123,923.76
6. Step 6: Final answer
   x = 108,600.70