Finding the Fourth Proportional to 1,096.17, 1,641.91 and 1,020.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,096.17 : 1,641.91 = 1,020.31 : x
2. Step 2: Convert to fraction form
   1,096.17/1,641.91 = 1,020.31/x
3. Step 3: Cross multiply
   1,096.17x = 1,641.91 × 1,020.31
4. Step 4: Simplify right side
   1,096.17x = 1,675,248.98
5. Step 5: Solve for x
   x = 1,675,248.98/1,096.17
6. Step 6: Final answer
   x = 1,528.28