Finding the Fourth Proportional to 78,520.39, 108,359.58 and 42,710.70

Step by Step Solution

1. Step 1: Write the proportion equation
   78,520.39 : 108,359.58 = 42,710.70 : x
2. Step 2: Convert to fraction form
   78,520.39/108,359.58 = 42,710.70/x
3. Step 3: Cross multiply
   78,520.39x = 108,359.58 × 42,710.70
4. Step 4: Simplify right side
   78,520.39x = 4,628,113,513.51
5. Step 5: Solve for x
   x = 4,628,113,513.51/78,520.39
6. Step 6: Final answer
   x = 58,941.55