Finding the Fourth Proportional to 1,535.43, 2,118.81 and 872.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,535.43 : 2,118.81 = 872.19 : x
2. Step 2: Convert to fraction form
   1,535.43/2,118.81 = 872.19/x
3. Step 3: Cross multiply
   1,535.43x = 2,118.81 × 872.19
4. Step 4: Simplify right side
   1,535.43x = 1,848,004.89
5. Step 5: Solve for x
   x = 1,848,004.89/1,535.43
6. Step 6: Final answer
   x = 1,203.57