Finding the Fourth Proportional to 78,426.40, 108,228.88 and 42,616.70

Step by Step Solution

1. Step 1: Write the proportion equation
   78,426.40 : 108,228.88 = 42,616.70 : x
2. Step 2: Convert to fraction form
   78,426.40/108,228.88 = 42,616.70/x
3. Step 3: Cross multiply
   78,426.40x = 108,228.88 × 42,616.70
4. Step 4: Simplify right side
   78,426.40x = 4,612,357,710.30
5. Step 5: Solve for x
   x = 4,612,357,710.30/78,426.40
6. Step 6: Final answer
   x = 58,811.29