Finding the Fourth Proportional to 1,099.69, 1,518.59 and 707.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.69 : 1,518.59 = 707.40 : x
2. Step 2: Convert to fraction form
   1,099.69/1,518.59 = 707.40/x
3. Step 3: Cross multiply
   1,099.69x = 1,518.59 × 707.40
4. Step 4: Simplify right side
   1,099.69x = 1,074,250.57
5. Step 5: Solve for x
   x = 1,074,250.57/1,099.69
6. Step 6: Final answer
   x = 976.87