Finding the Fourth Proportional to 9,401.84, 12,979.68 and 6,422.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,401.84 : 12,979.68 = 6,422.12 : x
2. Step 2: Convert to fraction form
   9,401.84/12,979.68 = 6,422.12/x
3. Step 3: Cross multiply
   9,401.84x = 12,979.68 × 6,422.12
4. Step 4: Simplify right side
   9,401.84x = 83,357,062.52
5. Step 5: Solve for x
   x = 83,357,062.52/9,401.84
6. Step 6: Final answer
   x = 8,866.04