Finding the Fourth Proportional to 78,339.60, 108,108.72 and 42,529.59

Step by Step Solution

1. Step 1: Write the proportion equation
   78,339.60 : 108,108.72 = 42,529.59 : x
2. Step 2: Convert to fraction form
   78,339.60/108,108.72 = 42,529.59/x
3. Step 3: Cross multiply
   78,339.60x = 108,108.72 × 42,529.59
4. Step 4: Simplify right side
   78,339.60x = 4,597,819,537.02
5. Step 5: Solve for x
   x = 4,597,819,537.02/78,339.60
6. Step 6: Final answer
   x = 58,690.87