Finding the Fourth Proportional to 84,662.99, 126,978.07 and 80,448.15

Step by Step Solution

1. Step 1: Write the proportion equation
   84,662.99 : 126,978.07 = 80,448.15 : x
2. Step 2: Convert to fraction form
   84,662.99/126,978.07 = 80,448.15/x
3. Step 3: Cross multiply
   84,662.99x = 126,978.07 × 80,448.15
4. Step 4: Simplify right side
   84,662.99x = 10,215,150,822.07
5. Step 5: Solve for x
   x = 10,215,150,822.07/84,662.99
6. Step 6: Final answer
   x = 120,656.63