Finding the Fourth Proportional to 5,679.72, 7,826.22 and 5,307.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,679.72 : 7,826.22 = 5,307.12 : x
2. Step 2: Convert to fraction form
   5,679.72/7,826.22 = 5,307.12/x
3. Step 3: Cross multiply
   5,679.72x = 7,826.22 × 5,307.12
4. Step 4: Simplify right side
   5,679.72x = 41,534,688.69
5. Step 5: Solve for x
   x = 41,534,688.69/5,679.72
6. Step 6: Final answer
   x = 7,312.81