Finding the Fourth Proportional to 2,613.06, 3,919.96 and 764.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.06 : 3,919.96 = 764.31 : x
2. Step 2: Convert to fraction form
   2,613.06/3,919.96 = 764.31/x
3. Step 3: Cross multiply
   2,613.06x = 3,919.96 × 764.31
4. Step 4: Simplify right side
   2,613.06x = 2,996,070.61
5. Step 5: Solve for x
   x = 2,996,070.61/2,613.06
6. Step 6: Final answer
   x = 1,146.58