Finding the Fourth Proportional to 1,532.72, 2,115.12 and 869.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,532.72 : 2,115.12 = 869.56 : x
2. Step 2: Convert to fraction form
   1,532.72/2,115.12 = 869.56/x
3. Step 3: Cross multiply
   1,532.72x = 2,115.12 × 869.56
4. Step 4: Simplify right side
   1,532.72x = 1,839,223.75
5. Step 5: Solve for x
   x = 1,839,223.75/1,532.72
6. Step 6: Final answer
   x = 1,199.97