Finding the Fourth Proportional to 1,535.15, 2,118.44 and 872.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,535.15 : 2,118.44 = 872.00 : x
2. Step 2: Convert to fraction form
   1,535.15/2,118.44 = 872.00/x
3. Step 3: Cross multiply
   1,535.15x = 2,118.44 × 872.00
4. Step 4: Simplify right side
   1,535.15x = 1,847,271.27
5. Step 5: Solve for x
   x = 1,847,271.27/1,535.15
6. Step 6: Final answer
   x = 1,203.31