Finding the Fourth Proportional to 2,656.98, 3,985.61 and 808.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.98 : 3,985.61 = 808.15 : x
2. Step 2: Convert to fraction form
   2,656.98/3,985.61 = 808.15/x
3. Step 3: Cross multiply
   2,656.98x = 3,985.61 × 808.15
4. Step 4: Simplify right side
   2,656.98x = 3,220,970.72
5. Step 5: Solve for x
   x = 3,220,970.72/2,656.98
6. Step 6: Final answer
   x = 1,212.27