Finding the Fourth Proportional to 76,978.60, 115,443.90 and 30,245.80

Step by Step Solution

1. Step 1: Write the proportion equation
   76,978.60 : 115,443.90 = 30,245.80 : x
2. Step 2: Convert to fraction form
   76,978.60/115,443.90 = 30,245.80/x
3. Step 3: Cross multiply
   76,978.60x = 115,443.90 × 30,245.80
4. Step 4: Simplify right side
   76,978.60x = 3,491,693,110.62
5. Step 5: Solve for x
   x = 3,491,693,110.62/76,978.60
6. Step 6: Final answer
   x = 45,359.27