Finding the Fourth Proportional to 1,707.25, 2,559.25 and 666.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,707.25 : 2,559.25 = 666.91 : x
2. Step 2: Convert to fraction form
   1,707.25/2,559.25 = 666.91/x
3. Step 3: Cross multiply
   1,707.25x = 2,559.25 × 666.91
4. Step 4: Simplify right side
   1,707.25x = 1,706,782.50
5. Step 5: Solve for x
   x = 1,706,782.50/1,707.25
6. Step 6: Final answer
   x = 999.72