Finding the Fourth Proportional to 76,978.92, 106,229.91 and 42,987.99

Step by Step Solution

1. Step 1: Write the proportion equation
   76,978.92 : 106,229.91 = 42,987.99 : x
2. Step 2: Convert to fraction form
   76,978.92/106,229.91 = 42,987.99/x
3. Step 3: Cross multiply
   76,978.92x = 106,229.91 × 42,987.99
4. Step 4: Simplify right side
   76,978.92x = 4,566,610,308.78
5. Step 5: Solve for x
   x = 4,566,610,308.78/76,978.92
6. Step 6: Final answer
   x = 59,322.87