Finding the Fourth Proportional to 1,087.22, 1,499.81 and 688.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.22 : 1,499.81 = 688.21 : x
2. Step 2: Convert to fraction form
   1,087.22/1,499.81 = 688.21/x
3. Step 3: Cross multiply
   1,087.22x = 1,499.81 × 688.21
4. Step 4: Simplify right side
   1,087.22x = 1,032,179.63
5. Step 5: Solve for x
   x = 1,032,179.63/1,087.22
6. Step 6: Final answer
   x = 949.38