Finding the Fourth Proportional to 1,212.59, 1,673.25 and 688.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.59 : 1,673.25 = 688.52 : x
2. Step 2: Convert to fraction form
   1,212.59/1,673.25 = 688.52/x
3. Step 3: Cross multiply
   1,212.59x = 1,673.25 × 688.52
4. Step 4: Simplify right side
   1,212.59x = 1,152,066.09
5. Step 5: Solve for x
   x = 1,152,066.09/1,212.59
6. Step 6: Final answer
   x = 950.09