Finding the Fourth Proportional to 1,091.59, 1,634.47 and 871.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.59 : 1,634.47 = 871.18 : x
2. Step 2: Convert to fraction form
   1,091.59/1,634.47 = 871.18/x
3. Step 3: Cross multiply
   1,091.59x = 1,634.47 × 871.18
4. Step 4: Simplify right side
   1,091.59x = 1,423,911.31
5. Step 5: Solve for x
   x = 1,423,911.31/1,091.59
6. Step 6: Final answer
   x = 1,304.44