Finding the Fourth Proportional to 1,918.17, 2,876.55 and 685.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,918.17 : 2,876.55 = 685.25 : x
2. Step 2: Convert to fraction form
   1,918.17/2,876.55 = 685.25/x
3. Step 3: Cross multiply
   1,918.17x = 2,876.55 × 685.25
4. Step 4: Simplify right side
   1,918.17x = 1,971,141.50
5. Step 5: Solve for x
   x = 1,971,141.50/1,918.17
6. Step 6: Final answer
   x = 1,027.62