Finding the Fourth Proportional to 82,322.56, 113,440.56 and 57,128.32

Step by Step Solution

1. Step 1: Write the proportion equation
   82,322.56 : 113,440.56 = 57,128.32 : x
2. Step 2: Convert to fraction form
   82,322.56/113,440.56 = 57,128.32/x
3. Step 3: Cross multiply
   82,322.56x = 113,440.56 × 57,128.32
4. Step 4: Simplify right side
   82,322.56x = 6,480,668,612.66
5. Step 5: Solve for x
   x = 6,480,668,612.66/82,322.56
6. Step 6: Final answer
   x = 78,722.88