Finding the Fourth Proportional to 70,128.32, 96,685.25 and 51,921.54

Step by Step Solution

1. Step 1: Write the proportion equation
   70,128.32 : 96,685.25 = 51,921.54 : x
2. Step 2: Convert to fraction form
   70,128.32/96,685.25 = 51,921.54/x
3. Step 3: Cross multiply
   70,128.32x = 96,685.25 × 51,921.54
4. Step 4: Simplify right side
   70,128.32x = 5,020,046,815.68
5. Step 5: Solve for x
   x = 5,020,046,815.68/70,128.32
6. Step 6: Final answer
   x = 71,583.74