Finding the Fourth Proportional to 129,744, 179,046.72 and 70,128

Step by Step Solution

1. Step 1: Write the proportion equation
   129,744 : 179,046.72 = 70,128 : x
2. Step 2: Convert to fraction form
   129,744/179,046.72 = 70,128/x
3. Step 3: Cross multiply
   129,744x = 179,046.72 × 70,128
4. Step 4: Simplify right side
   129,744x = 12,556,188,380.16
5. Step 5: Solve for x
   x = 12,556,188,380.16/129,744
6. Step 6: Final answer
   x = 96,776.64