Finding the Fourth Proportional to 76,969.28, 106,216.56 and 42,978.32

Step by Step Solution

1. Step 1: Write the proportion equation
   76,969.28 : 106,216.56 = 42,978.32 : x
2. Step 2: Convert to fraction form
   76,969.28/106,216.56 = 42,978.32/x
3. Step 3: Cross multiply
   76,969.28x = 106,216.56 × 42,978.32
4. Step 4: Simplify right side
   76,969.28x = 4,565,009,304.98
5. Step 5: Solve for x
   x = 4,565,009,304.98/76,969.28
6. Step 6: Final answer
   x = 59,309.50