Finding the Fourth Proportional to 1,688.31, 2,533.28 and 1,072.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.31 : 2,533.28 = 1,072.71 : x
2. Step 2: Convert to fraction form
   1,688.31/2,533.28 = 1,072.71/x
3. Step 3: Cross multiply
   1,688.31x = 2,533.28 × 1,072.71
4. Step 4: Simplify right side
   1,688.31x = 2,717,469.43
5. Step 5: Solve for x
   x = 2,717,469.43/1,688.31
6. Step 6: Final answer
   x = 1,609.58