Finding the Fourth Proportional to 1,017.91, 1,525.11 and 688.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.91 : 1,525.11 = 688.12 : x
2. Step 2: Convert to fraction form
   1,017.91/1,525.11 = 688.12/x
3. Step 3: Cross multiply
   1,017.91x = 1,525.11 × 688.12
4. Step 4: Simplify right side
   1,017.91x = 1,049,458.69
5. Step 5: Solve for x
   x = 1,049,458.69/1,017.91
6. Step 6: Final answer
   x = 1,030.99