Finding the Fourth Proportional to 78,400.86, 108,191.88 and 42,591.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,400.86 : 108,191.88 = 42,591.42 : x
2. Step 2: Convert to fraction form
   78,400.86/108,191.88 = 42,591.42/x
3. Step 3: Cross multiply
   78,400.86x = 108,191.88 × 42,591.42
4. Step 4: Simplify right side
   78,400.86x = 4,608,045,801.67
5. Step 5: Solve for x
   x = 4,608,045,801.67/78,400.86
6. Step 6: Final answer
   x = 58,775.45