Finding the Fourth Proportional to 78,569.66, 108,424.05 and 42,758.90

Step by Step Solution

1. Step 1: Write the proportion equation
   78,569.66 : 108,424.05 = 42,758.90 : x
2. Step 2: Convert to fraction form
   78,569.66/108,424.05 = 42,758.90/x
3. Step 3: Cross multiply
   78,569.66x = 108,424.05 × 42,758.90
4. Step 4: Simplify right side
   78,569.66x = 4,636,093,111.55
5. Step 5: Solve for x
   x = 4,636,093,111.55/78,569.66
6. Step 6: Final answer
   x = 59,006.15