Finding the Fourth Proportional to 2,656.42, 3,983.40 and 807.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,656.42 : 3,983.40 = 807.12 : x
2. Step 2: Convert to fraction form
   2,656.42/3,983.40 = 807.12/x
3. Step 3: Cross multiply
   2,656.42x = 3,983.40 × 807.12
4. Step 4: Simplify right side
   2,656.42x = 3,215,081.81
5. Step 5: Solve for x
   x = 3,215,081.81/2,656.42
6. Step 6: Final answer
   x = 1,210.31