Finding the Fourth Proportional to 111,086.88, 153,140.40 and 79,200.40

Step by Step Solution

1. Step 1: Write the proportion equation
   111,086.88 : 153,140.40 = 79,200.40 : x
2. Step 2: Convert to fraction form
   111,086.88/153,140.40 = 79,200.40/x
3. Step 3: Cross multiply
   111,086.88x = 153,140.40 × 79,200.40
4. Step 4: Simplify right side
   111,086.88x = 12,128,780,936.16
5. Step 5: Solve for x
   x = 12,128,780,936.16/111,086.88
6. Step 6: Final answer
   x = 109,182.84