Finding the Fourth Proportional to 1,013.94, 1,518.93 and 688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.94 : 1,518.93 = 688.50 : x
2. Step 2: Convert to fraction form
   1,013.94/1,518.93 = 688.50/x
3. Step 3: Cross multiply
   1,013.94x = 1,518.93 × 688.50
4. Step 4: Simplify right side
   1,013.94x = 1,045,783.31
5. Step 5: Solve for x
   x = 1,045,783.31/1,013.94
6. Step 6: Final answer
   x = 1,031.41