Finding the Fourth Proportional to 3,978.32, 5,490 and 2,210

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.32 : 5,490 = 2,210 : x
2. Step 2: Convert to fraction form
   3,978.32/5,490 = 2,210/x
3. Step 3: Cross multiply
   3,978.32x = 5,490 × 2,210
4. Step 4: Simplify right side
   3,978.32x = 12,132,900
5. Step 5: Solve for x
   x = 12,132,900/3,978.32
6. Step 6: Final answer
   x = 3,049.75