Finding the Fourth Proportional to 70,128.32, 96,773.12 and 39,921

Step by Step Solution

1. Step 1: Write the proportion equation
   70,128.32 : 96,773.12 = 39,921 : x
2. Step 2: Convert to fraction form
   70,128.32/96,773.12 = 39,921/x
3. Step 3: Cross multiply
   70,128.32x = 96,773.12 × 39,921
4. Step 4: Simplify right side
   70,128.32x = 3,863,279,723.52
5. Step 5: Solve for x
   x = 3,863,279,723.52/70,128.32
6. Step 6: Final answer
   x = 55,088.72