Finding the Fourth Proportional to 2,989.80, 4,126.06 and 2,491.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,989.80 : 4,126.06 = 2,491.61 : x
2. Step 2: Convert to fraction form
   2,989.80/4,126.06 = 2,491.61/x
3. Step 3: Cross multiply
   2,989.80x = 4,126.06 × 2,491.61
4. Step 4: Simplify right side
   2,989.80x = 10,280,499.27
5. Step 5: Solve for x
   x = 10,280,499.27/2,989.80
6. Step 6: Final answer
   x = 3,438.52