Finding the Fourth Proportional to 2,656.39, 3,984.71 and 807.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.39 : 3,984.71 = 807.77 : x
2. Step 2: Convert to fraction form
   2,656.39/3,984.71 = 807.77/x
3. Step 3: Cross multiply
   2,656.39x = 3,984.71 × 807.77
4. Step 4: Simplify right side
   2,656.39x = 3,218,729.20
5. Step 5: Solve for x
   x = 3,218,729.20/2,656.39
6. Step 6: Final answer
   x = 1,211.69