Finding the Fourth Proportional to 78,617.36, 108,490.55 and 42,806.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,617.36 : 108,490.55 = 42,806.72 : x
2. Step 2: Convert to fraction form
   78,617.36/108,490.55 = 42,806.72/x
3. Step 3: Cross multiply
   78,617.36x = 108,490.55 × 42,806.72
4. Step 4: Simplify right side
   78,617.36x = 4,644,123,840.01
5. Step 5: Solve for x
   x = 4,644,123,840.01/78,617.36
6. Step 6: Final answer
   x = 59,072.50