Finding the Fourth Proportional to 128,443.36, 177,225.29 and 88,142.42

Step by Step Solution

1. Step 1: Write the proportion equation
   128,443.36 : 177,225.29 = 88,142.42 : x
2. Step 2: Convert to fraction form
   128,443.36/177,225.29 = 88,142.42/x
3. Step 3: Cross multiply
   128,443.36x = 177,225.29 × 88,142.42
4. Step 4: Simplify right side
   128,443.36x = 15,621,065,945.80
5. Step 5: Solve for x
   x = 15,621,065,945.80/128,443.36
6. Step 6: Final answer
   x = 121,618.32