Finding the Fourth Proportional to 9,662.78, 14,475.18 and 5,490.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,662.78 : 14,475.18 = 5,490.30 : x
2. Step 2: Convert to fraction form
   9,662.78/14,475.18 = 5,490.30/x
3. Step 3: Cross multiply
   9,662.78x = 14,475.18 × 5,490.30
4. Step 4: Simplify right side
   9,662.78x = 79,473,080.75
5. Step 5: Solve for x
   x = 79,473,080.75/9,662.78
6. Step 6: Final answer
   x = 8,224.66