Finding the Fourth Proportional to 1,535.09, 2,118.48 and 871.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,535.09 : 2,118.48 = 871.91 : x
2. Step 2: Convert to fraction form
   1,535.09/2,118.48 = 871.91/x
3. Step 3: Cross multiply
   1,535.09x = 2,118.48 × 871.91
4. Step 4: Simplify right side
   1,535.09x = 1,847,123.90
5. Step 5: Solve for x
   x = 1,847,123.90/1,535.09
6. Step 6: Final answer
   x = 1,203.27