Finding the Fourth Proportional to 1,554.67, 2,332.82 and 688.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.67 : 2,332.82 = 688.78 : x
2. Step 2: Convert to fraction form
   1,554.67/2,332.82 = 688.78/x
3. Step 3: Cross multiply
   1,554.67x = 2,332.82 × 688.78
4. Step 4: Simplify right side
   1,554.67x = 1,606,800.52
5. Step 5: Solve for x
   x = 1,606,800.52/1,554.67
6. Step 6: Final answer
   x = 1,033.53