Finding the Fourth Proportional to 9,479.61, 13,081.91 and 5,230.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,479.61 : 13,081.91 = 5,230.72 : x
2. Step 2: Convert to fraction form
   9,479.61/13,081.91 = 5,230.72/x
3. Step 3: Cross multiply
   9,479.61x = 13,081.91 × 5,230.72
4. Step 4: Simplify right side
   9,479.61x = 68,427,808.28
5. Step 5: Solve for x
   x = 68,427,808.28/9,479.61
6. Step 6: Final answer
   x = 7,218.42