Finding the Fourth Proportional to 124,131.72, 171,141.66 and 90,189.48

Step by Step Solution

1. Step 1: Write the proportion equation
   124,131.72 : 171,141.66 = 90,189.48 : x
2. Step 2: Convert to fraction form
   124,131.72/171,141.66 = 90,189.48/x
3. Step 3: Cross multiply
   124,131.72x = 171,141.66 × 90,189.48
4. Step 4: Simplify right side
   124,131.72x = 15,435,177,321.74
5. Step 5: Solve for x
   x = 15,435,177,321.74/124,131.72
6. Step 6: Final answer
   x = 124,345.15