Finding the Fourth Proportional to 3,521.88, 4,861.18 and 2,105.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,521.88 : 4,861.18 = 2,105.88 : x
2. Step 2: Convert to fraction form
   3,521.88/4,861.18 = 2,105.88/x
3. Step 3: Cross multiply
   3,521.88x = 4,861.18 × 2,105.88
4. Step 4: Simplify right side
   3,521.88x = 10,237,061.74
5. Step 5: Solve for x
   x = 10,237,061.74/3,521.88
6. Step 6: Final answer
   x = 2,906.70