Finding the Fourth Proportional to 83,721.40, 125,363.40 and 79,784.80

Step by Step Solution

1. Step 1: Write the proportion equation
   83,721.40 : 125,363.40 = 79,784.80 : x
2. Step 2: Convert to fraction form
   83,721.40/125,363.40 = 79,784.80/x
3. Step 3: Cross multiply
   83,721.40x = 125,363.40 × 79,784.80
4. Step 4: Simplify right side
   83,721.40x = 10,002,093,796.32
5. Step 5: Solve for x
   x = 10,002,093,796.32/83,721.40
6. Step 6: Final answer
   x = 119,468.78