Finding the Fourth Proportional to 1,584.98, 2,187.07 and 876.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,584.98 : 2,187.07 = 876.72 : x
2. Step 2: Convert to fraction form
   1,584.98/2,187.07 = 876.72/x
3. Step 3: Cross multiply
   1,584.98x = 2,187.07 × 876.72
4. Step 4: Simplify right side
   1,584.98x = 1,917,445.82
5. Step 5: Solve for x
   x = 1,917,445.82/1,584.98
6. Step 6: Final answer
   x = 1,209.76