Finding the Fourth Proportional to 9,412.23, 12,979.92 and 7,170.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,412.23 : 12,979.92 = 7,170.15 : x
2. Step 2: Convert to fraction form
   9,412.23/12,979.92 = 7,170.15/x
3. Step 3: Cross multiply
   9,412.23x = 12,979.92 × 7,170.15
4. Step 4: Simplify right side
   9,412.23x = 93,067,973.39
5. Step 5: Solve for x
   x = 93,067,973.39/9,412.23
6. Step 6: Final answer
   x = 9,887.98