Finding the Fourth Proportional to 78,386, 108,173 and 42,576.61

Step by Step Solution

1. Step 1: Write the proportion equation
   78,386 : 108,173 = 42,576.61 : x
2. Step 2: Convert to fraction form
   78,386/108,173 = 42,576.61/x
3. Step 3: Cross multiply
   78,386x = 108,173 × 42,576.61
4. Step 4: Simplify right side
   78,386x = 4,605,639,633.53
5. Step 5: Solve for x
   x = 4,605,639,633.53/78,386
6. Step 6: Final answer
   x = 58,755.90