Finding the Fourth Proportional to 1,087.20, 1,499.86 and 693.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.20 : 1,499.86 = 693.98 : x
2. Step 2: Convert to fraction form
   1,087.20/1,499.86 = 693.98/x
3. Step 3: Cross multiply
   1,087.20x = 1,499.86 × 693.98
4. Step 4: Simplify right side
   1,087.20x = 1,040,872.84
5. Step 5: Solve for x
   x = 1,040,872.84/1,087.20
6. Step 6: Final answer
   x = 957.39