Finding the Fourth Proportional to 1,212.52, 1,673.31 and 688.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.52 : 1,673.31 = 688.63 : x
2. Step 2: Convert to fraction form
   1,212.52/1,673.31 = 688.63/x
3. Step 3: Cross multiply
   1,212.52x = 1,673.31 × 688.63
4. Step 4: Simplify right side
   1,212.52x = 1,152,291.47
5. Step 5: Solve for x
   x = 1,152,291.47/1,212.52
6. Step 6: Final answer
   x = 950.33