Finding the Fourth Proportional to 10,306.42, 14,222.88 and 5,590.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,306.42 : 14,222.88 = 5,590.72 : x
2. Step 2: Convert to fraction form
   10,306.42/14,222.88 = 5,590.72/x
3. Step 3: Cross multiply
   10,306.42x = 14,222.88 × 5,590.72
4. Step 4: Simplify right side
   10,306.42x = 79,516,139.67
5. Step 5: Solve for x
   x = 79,516,139.67/10,306.42
6. Step 6: Final answer
   x = 7,715.20