Finding the Fourth Proportional to 2,079.52, 2,869.60 and 1,638.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.52 : 2,869.60 = 1,638.56 : x
2. Step 2: Convert to fraction form
   2,079.52/2,869.60 = 1,638.56/x
3. Step 3: Cross multiply
   2,079.52x = 2,869.60 × 1,638.56
4. Step 4: Simplify right side
   2,079.52x = 4,702,011.78
5. Step 5: Solve for x
   x = 4,702,011.78/2,079.52
6. Step 6: Final answer
   x = 2,261.10