Finding the Fourth Proportional to 78,456.71, 108,268.99 and 42,647.63

Step by Step Solution

1. Step 1: Write the proportion equation
   78,456.71 : 108,268.99 = 42,647.63 : x
2. Step 2: Convert to fraction form
   78,456.71/108,268.99 = 42,647.63/x
3. Step 3: Cross multiply
   78,456.71x = 108,268.99 × 42,647.63
4. Step 4: Simplify right side
   78,456.71x = 4,617,415,178.03
5. Step 5: Solve for x
   x = 4,617,415,178.03/78,456.71
6. Step 6: Final answer
   x = 58,853.03