Finding the Fourth Proportional to 78,726.80, 108,640.24 and 42,916.10

Step by Step Solution

1. Step 1: Write the proportion equation
   78,726.80 : 108,640.24 = 42,916.10 : x
2. Step 2: Convert to fraction form
   78,726.80/108,640.24 = 42,916.10/x
3. Step 3: Cross multiply
   78,726.80x = 108,640.24 × 42,916.10
4. Step 4: Simplify right side
   78,726.80x = 4,662,414,753.37
5. Step 5: Solve for x
   x = 4,662,414,753.37/78,726.80
6. Step 6: Final answer
   x = 59,222.71