Finding the Fourth Proportional to 1,074.87, 1,613.31 and 709.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,074.87 : 1,613.31 = 709.89 : x
2. Step 2: Convert to fraction form
   1,074.87/1,613.31 = 709.89/x
3. Step 3: Cross multiply
   1,074.87x = 1,613.31 × 709.89
4. Step 4: Simplify right side
   1,074.87x = 1,145,272.64
5. Step 5: Solve for x
   x = 1,145,272.64/1,074.87
6. Step 6: Final answer
   x = 1,065.50