Finding the Fourth Proportional to 1,530.57, 2,112.18 and 867.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.57 : 2,112.18 = 867.55 : x
2. Step 2: Convert to fraction form
   1,530.57/2,112.18 = 867.55/x
3. Step 3: Cross multiply
   1,530.57x = 2,112.18 × 867.55
4. Step 4: Simplify right side
   1,530.57x = 1,832,406.86
5. Step 5: Solve for x
   x = 1,832,406.86/1,530.57
6. Step 6: Final answer
   x = 1,197.21