Finding the Fourth Proportional to 1,535.51, 2,118.88 and 872.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,535.51 : 2,118.88 = 872.24 : x
2. Step 2: Convert to fraction form
   1,535.51/2,118.88 = 872.24/x
3. Step 3: Cross multiply
   1,535.51x = 2,118.88 × 872.24
4. Step 4: Simplify right side
   1,535.51x = 1,848,171.89
5. Step 5: Solve for x
   x = 1,848,171.89/1,535.51
6. Step 6: Final answer
   x = 1,203.62