Finding the Fourth Proportional to 78,385, 108,171.62 and 42,575.61

Step by Step Solution

1. Step 1: Write the proportion equation
   78,385 : 108,171.62 = 42,575.61 : x
2. Step 2: Convert to fraction form
   78,385/108,171.62 = 42,575.61/x
3. Step 3: Cross multiply
   78,385x = 108,171.62 × 42,575.61
4. Step 4: Simplify right side
   78,385x = 4,605,472,706.19
5. Step 5: Solve for x
   x = 4,605,472,706.19/78,385
6. Step 6: Final answer
   x = 58,754.52