Finding the Fourth Proportional to 105,258.32, 145,258.56 and 57,514.64

Step by Step Solution

1. Step 1: Write the proportion equation
   105,258.32 : 145,258.56 = 57,514.64 : x
2. Step 2: Convert to fraction form
   105,258.32/145,258.56 = 57,514.64/x
3. Step 3: Cross multiply
   105,258.32x = 145,258.56 × 57,514.64
4. Step 4: Simplify right side
   105,258.32x = 8,354,493,785.32
5. Step 5: Solve for x
   x = 8,354,493,785.32/105,258.32
6. Step 6: Final answer
   x = 79,371.34