Finding the Fourth Proportional to 1,014.78, 1,520.37 and 688.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.78 : 1,520.37 = 688.98 : x
2. Step 2: Convert to fraction form
   1,014.78/1,520.37 = 688.98/x
3. Step 3: Cross multiply
   1,014.78x = 1,520.37 × 688.98
4. Step 4: Simplify right side
   1,014.78x = 1,047,504.52
5. Step 5: Solve for x
   x = 1,047,504.52/1,014.78
6. Step 6: Final answer
   x = 1,032.25