Finding the Fourth Proportional to 1,296.22, 1,788.15 and 876.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,296.22 : 1,788.15 = 876.61 : x
2. Step 2: Convert to fraction form
   1,296.22/1,788.15 = 876.61/x
3. Step 3: Cross multiply
   1,296.22x = 1,788.15 × 876.61
4. Step 4: Simplify right side
   1,296.22x = 1,567,510.17
5. Step 5: Solve for x
   x = 1,567,510.17/1,296.22
6. Step 6: Final answer
   x = 1,209.29