Finding the Fourth Proportional to 140,322.24, 193,680 and 90,108.72

Step by Step Solution

1. Step 1: Write the proportion equation
   140,322.24 : 193,680 = 90,108.72 : x
2. Step 2: Convert to fraction form
   140,322.24/193,680 = 90,108.72/x
3. Step 3: Cross multiply
   140,322.24x = 193,680 × 90,108.72
4. Step 4: Simplify right side
   140,322.24x = 17,452,256,889.60
5. Step 5: Solve for x
   x = 17,452,256,889.60/140,322.24
6. Step 6: Final answer
   x = 124,372.71