Finding the Fourth Proportional to 9,622.56, 13,279.44 and 5,431.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,622.56 : 13,279.44 = 5,431.20 : x
2. Step 2: Convert to fraction form
   9,622.56/13,279.44 = 5,431.20/x
3. Step 3: Cross multiply
   9,622.56x = 13,279.44 × 5,431.20
4. Step 4: Simplify right side
   9,622.56x = 72,123,294.53
5. Step 5: Solve for x
   x = 72,123,294.53/9,622.56
6. Step 6: Final answer
   x = 7,495.23