Finding the Fourth Proportional to 1,638.47, 2,458.72 and 714.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.47 : 2,458.72 = 714.03 : x
2. Step 2: Convert to fraction form
   1,638.47/2,458.72 = 714.03/x
3. Step 3: Cross multiply
   1,638.47x = 2,458.72 × 714.03
4. Step 4: Simplify right side
   1,638.47x = 1,755,599.84
5. Step 5: Solve for x
   x = 1,755,599.84/1,638.47
6. Step 6: Final answer
   x = 1,071.49