Finding the Fourth Proportional to 1,370.33, 1,891.35 and 872.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.33 : 1,891.35 = 872.86 : x
2. Step 2: Convert to fraction form
   1,370.33/1,891.35 = 872.86/x
3. Step 3: Cross multiply
   1,370.33x = 1,891.35 × 872.86
4. Step 4: Simplify right side
   1,370.33x = 1,650,874.30
5. Step 5: Solve for x
   x = 1,650,874.30/1,370.33
6. Step 6: Final answer
   x = 1,204.73