Finding the Fourth Proportional to 9,404.88, 12,979.20 and 5,213.13

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.88 : 12,979.20 = 5,213.13 : x
2. Step 2: Convert to fraction form
   9,404.88/12,979.20 = 5,213.13/x
3. Step 3: Cross multiply
   9,404.88x = 12,979.20 × 5,213.13
4. Step 4: Simplify right side
   9,404.88x = 67,662,256.90
5. Step 5: Solve for x
   x = 67,662,256.90/9,404.88
6. Step 6: Final answer
   x = 7,194.38