Finding the Fourth Proportional to 2,598, 3,896.72 and 866

Step by Step Solution

1. Step 1: Write the proportion equation
   2,598 : 3,896.72 = 866 : x
2. Step 2: Convert to fraction form
   2,598/3,896.72 = 866/x
3. Step 3: Cross multiply
   2,598x = 3,896.72 × 866
4. Step 4: Simplify right side
   2,598x = 3,374,559.52
5. Step 5: Solve for x
   x = 3,374,559.52/2,598
6. Step 6: Final answer
   x = 1,298.91