Finding the Fourth Proportional to 8,934.91, 12,328.40 and 5,398.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,934.91 : 12,328.40 = 5,398.31 : x
2. Step 2: Convert to fraction form
   8,934.91/12,328.40 = 5,398.31/x
3. Step 3: Cross multiply
   8,934.91x = 12,328.40 × 5,398.31
4. Step 4: Simplify right side
   8,934.91x = 66,552,498.01
5. Step 5: Solve for x
   x = 66,552,498.01/8,934.91
6. Step 6: Final answer
   x = 7,448.60