Finding the Fourth Proportional to 1,018.19, 1,526.56 and 688.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.19 : 1,526.56 = 688.32 : x
2. Step 2: Convert to fraction form
   1,018.19/1,526.56 = 688.32/x
3. Step 3: Cross multiply
   1,018.19x = 1,526.56 × 688.32
4. Step 4: Simplify right side
   1,018.19x = 1,050,760.06
5. Step 5: Solve for x
   x = 1,050,760.06/1,018.19
6. Step 6: Final answer
   x = 1,031.99