Finding the Fourth Proportional to 2,656.63, 3,985.38 and 807.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.63 : 3,985.38 = 807.31 : x
2. Step 2: Convert to fraction form
   2,656.63/3,985.38 = 807.31/x
3. Step 3: Cross multiply
   2,656.63x = 3,985.38 × 807.31
4. Step 4: Simplify right side
   2,656.63x = 3,217,435.28
5. Step 5: Solve for x
   x = 3,217,435.28/2,656.63
6. Step 6: Final answer
   x = 1,211.10