Finding the Fourth Proportional to 3,978.29, 5,490.21 and 2,299.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.29 : 5,490.21 = 2,299.91 : x
2. Step 2: Convert to fraction form
   3,978.29/5,490.21 = 2,299.91/x
3. Step 3: Cross multiply
   3,978.29x = 5,490.21 × 2,299.91
4. Step 4: Simplify right side
   3,978.29x = 12,626,961.43
5. Step 5: Solve for x
   x = 12,626,961.43/3,978.29
6. Step 6: Final answer
   x = 3,173.97