Finding the Fourth Proportional to 9,581.72, 13,222.80 and 5,389.70

Step by Step Solution

1. Step 1: Write the proportion equation
   9,581.72 : 13,222.80 = 5,389.70 : x
2. Step 2: Convert to fraction form
   9,581.72/13,222.80 = 5,389.70/x
3. Step 3: Cross multiply
   9,581.72x = 13,222.80 × 5,389.70
4. Step 4: Simplify right side
   9,581.72x = 71,266,925.16
5. Step 5: Solve for x
   x = 71,266,925.16/9,581.72
6. Step 6: Final answer
   x = 7,437.80