Finding the Fourth Proportional to 2,521.07, 3,478.88 and 1,638.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.07 : 3,478.88 = 1,638.53 : x
2. Step 2: Convert to fraction form
   2,521.07/3,478.88 = 1,638.53/x
3. Step 3: Cross multiply
   2,521.07x = 3,478.88 × 1,638.53
4. Step 4: Simplify right side
   2,521.07x = 5,700,241.05
5. Step 5: Solve for x
   x = 5,700,241.05/2,521.07
6. Step 6: Final answer
   x = 2,261.04