Finding the Fourth Proportional to 1,086.99, 1,500.62 and 688.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.99 : 1,500.62 = 688.79 : x
2. Step 2: Convert to fraction form
   1,086.99/1,500.62 = 688.79/x
3. Step 3: Cross multiply
   1,086.99x = 1,500.62 × 688.79
4. Step 4: Simplify right side
   1,086.99x = 1,033,601.10
5. Step 5: Solve for x
   x = 1,033,601.10/1,086.99
6. Step 6: Final answer
   x = 950.88