Finding the Fourth Proportional to 78,665.28, 108,557.52 and 42,855.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,665.28 : 108,557.52 = 42,855.28 : x
2. Step 2: Convert to fraction form
   78,665.28/108,557.52 = 42,855.28/x
3. Step 3: Cross multiply
   78,665.28x = 108,557.52 × 42,855.28
4. Step 4: Simplify right side
   78,665.28x = 4,652,262,483.60
5. Step 5: Solve for x
   x = 4,652,262,483.60/78,665.28
6. Step 6: Final answer
   x = 59,139.98