Finding the Fourth Proportional to 9,402.75, 12,976.20 and 5,211

Step by Step Solution

1. Step 1: Write the proportion equation
   9,402.75 : 12,976.20 = 5,211 : x
2. Step 2: Convert to fraction form
   9,402.75/12,976.20 = 5,211/x
3. Step 3: Cross multiply
   9,402.75x = 12,976.20 × 5,211
4. Step 4: Simplify right side
   9,402.75x = 67,618,978.20
5. Step 5: Solve for x
   x = 67,618,978.20/9,402.75
6. Step 6: Final answer
   x = 7,191.40