Finding the Fourth Proportional to 78,665.48, 108,557.93 and 42,855.40

Step by Step Solution

1. Step 1: Write the proportion equation
   78,665.48 : 108,557.93 = 42,855.40 : x
2. Step 2: Convert to fraction form
   78,665.48/108,557.93 = 42,855.40/x
3. Step 3: Cross multiply
   78,665.48x = 108,557.93 × 42,855.40
4. Step 4: Simplify right side
   78,665.48x = 4,652,293,513.32
5. Step 5: Solve for x
   x = 4,652,293,513.32/78,665.48
6. Step 6: Final answer
   x = 59,140.22