Finding the Fourth Proportional to 1,707.82, 2,561.69 and 612.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,707.82 : 2,561.69 = 612.90 : x
2. Step 2: Convert to fraction form
   1,707.82/2,561.69 = 612.90/x
3. Step 3: Cross multiply
   1,707.82x = 2,561.69 × 612.90
4. Step 4: Simplify right side
   1,707.82x = 1,570,061.33
5. Step 5: Solve for x
   x = 1,570,061.33/1,707.82
6. Step 6: Final answer
   x = 919.34