Finding the Fourth Proportional to 9,478.88, 13,081.59 and 5,230.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,478.88 : 13,081.59 = 5,230.78 : x
2. Step 2: Convert to fraction form
   9,478.88/13,081.59 = 5,230.78/x
3. Step 3: Cross multiply
   9,478.88x = 13,081.59 × 5,230.78
4. Step 4: Simplify right side
   9,478.88x = 68,426,827.78
5. Step 5: Solve for x
   x = 68,426,827.78/9,478.88
6. Step 6: Final answer
   x = 7,218.88