Finding the Fourth Proportional to 1,013.98, 1,518.52 and 688.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.98 : 1,518.52 = 688.36 : x
2. Step 2: Convert to fraction form
   1,013.98/1,518.52 = 688.36/x
3. Step 3: Cross multiply
   1,013.98x = 1,518.52 × 688.36
4. Step 4: Simplify right side
   1,013.98x = 1,045,288.43
5. Step 5: Solve for x
   x = 1,045,288.43/1,013.98
6. Step 6: Final answer
   x = 1,030.88