Finding the Fourth Proportional to 1,687.03, 2,528.71 and 1,071.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.03 : 2,528.71 = 1,071.02 : x
2. Step 2: Convert to fraction form
   1,687.03/2,528.71 = 1,071.02/x
3. Step 3: Cross multiply
   1,687.03x = 2,528.71 × 1,071.02
4. Step 4: Simplify right side
   1,687.03x = 2,708,298.98
5. Step 5: Solve for x
   x = 2,708,298.98/1,687.03
6. Step 6: Final answer
   x = 1,605.37