Finding the Fourth Proportional to 5,321.70, 7,341.03 and 3,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,321.70 : 7,341.03 = 3,978.72 : x
2. Step 2: Convert to fraction form
   5,321.70/7,341.03 = 3,978.72/x
3. Step 3: Cross multiply
   5,321.70x = 7,341.03 × 3,978.72
4. Step 4: Simplify right side
   5,321.70x = 29,207,902.88
5. Step 5: Solve for x
   x = 29,207,902.88/5,321.70
6. Step 6: Final answer
   x = 5,488.45