Finding the Fourth Proportional to 2,659.82, 3,988.52 and 811.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.82 : 3,988.52 = 811.16 : x
2. Step 2: Convert to fraction form
   2,659.82/3,988.52 = 811.16/x
3. Step 3: Cross multiply
   2,659.82x = 3,988.52 × 811.16
4. Step 4: Simplify right side
   2,659.82x = 3,235,327.88
5. Step 5: Solve for x
   x = 3,235,327.88/2,659.82
6. Step 6: Final answer
   x = 1,216.37