Finding the Fourth Proportional to 78,400.70, 108,193.89 and 42,591.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,400.70 : 108,193.89 = 42,591.28 : x
2. Step 2: Convert to fraction form
   78,400.70/108,193.89 = 42,591.28/x
3. Step 3: Cross multiply
   78,400.70x = 108,193.89 × 42,591.28
4. Step 4: Simplify right side
   78,400.70x = 4,608,116,234.52
5. Step 5: Solve for x
   x = 4,608,116,234.52/78,400.70
6. Step 6: Final answer
   x = 58,776.47