Finding the Fourth Proportional to 78,245.91, 107,978.31 and 42,435.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,245.91 : 107,978.31 = 42,435.72 : x
2. Step 2: Convert to fraction form
   78,245.91/107,978.31 = 42,435.72/x
3. Step 3: Cross multiply
   78,245.91x = 107,978.31 × 42,435.72
4. Step 4: Simplify right side
   78,245.91x = 4,582,137,329.23
5. Step 5: Solve for x
   x = 4,582,137,329.23/78,245.91
6. Step 6: Final answer
   x = 58,560.73