Finding the Fourth Proportional to 1,638.79, 2,458.59 and 714.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.79 : 2,458.59 = 714.52 : x
2. Step 2: Convert to fraction form
   1,638.79/2,458.59 = 714.52/x
3. Step 3: Cross multiply
   1,638.79x = 2,458.59 × 714.52
4. Step 4: Simplify right side
   1,638.79x = 1,756,711.73
5. Step 5: Solve for x
   x = 1,756,711.73/1,638.79
6. Step 6: Final answer
   x = 1,071.96