Finding the Fourth Proportional to 1,791.47, 2,686.53 and 866.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,791.47 : 2,686.53 = 866.72 : x
2. Step 2: Convert to fraction form
   1,791.47/2,686.53 = 866.72/x
3. Step 3: Cross multiply
   1,791.47x = 2,686.53 × 866.72
4. Step 4: Simplify right side
   1,791.47x = 2,328,469.28
5. Step 5: Solve for x
   x = 2,328,469.28/1,791.47
6. Step 6: Final answer
   x = 1,299.75