Finding the Fourth Proportional to 128,418.75, 177,158.16 and 83,111.31

Step by Step Solution

1. Step 1: Write the proportion equation
   128,418.75 : 177,158.16 = 83,111.31 : x
2. Step 2: Convert to fraction form
   128,418.75/177,158.16 = 83,111.31/x
3. Step 3: Cross multiply
   128,418.75x = 177,158.16 × 83,111.31
4. Step 4: Simplify right side
   128,418.75x = 14,723,846,754.79
5. Step 5: Solve for x
   x = 14,723,846,754.79/128,418.75
6. Step 6: Final answer
   x = 114,654.96