Finding the Fourth Proportional to 1,707.81, 2,561.59 and 667.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,707.81 : 2,561.59 = 667.62 : x
2. Step 2: Convert to fraction form
   1,707.81/2,561.59 = 667.62/x
3. Step 3: Cross multiply
   1,707.81x = 2,561.59 × 667.62
4. Step 4: Simplify right side
   1,707.81x = 1,710,155.91
5. Step 5: Solve for x
   x = 1,710,155.91/1,707.81
6. Step 6: Final answer
   x = 1,001.37