Finding the Fourth Proportional to 2,656.91, 3,985.54 and 808.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.91 : 3,985.54 = 808.17 : x
2. Step 2: Convert to fraction form
   2,656.91/3,985.54 = 808.17/x
3. Step 3: Cross multiply
   2,656.91x = 3,985.54 × 808.17
4. Step 4: Simplify right side
   2,656.91x = 3,220,993.86
5. Step 5: Solve for x
   x = 3,220,993.86/2,656.91
6. Step 6: Final answer
   x = 1,212.31