Finding the Fourth Proportional to 78,400.58, 108,193.72 and 42,591.15

Step by Step Solution

1. Step 1: Write the proportion equation
   78,400.58 : 108,193.72 = 42,591.15 : x
2. Step 2: Convert to fraction form
   78,400.58/108,193.72 = 42,591.15/x
3. Step 3: Cross multiply
   78,400.58x = 108,193.72 × 42,591.15
4. Step 4: Simplify right side
   78,400.58x = 4,608,095,336.68
5. Step 5: Solve for x
   x = 4,608,095,336.68/78,400.58
6. Step 6: Final answer
   x = 58,776.29