Finding the Fourth Proportional to 1,431.52, 1,976.37 and 1,099.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.52 : 1,976.37 = 1,099.30 : x
2. Step 2: Convert to fraction form
   1,431.52/1,976.37 = 1,099.30/x
3. Step 3: Cross multiply
   1,431.52x = 1,976.37 × 1,099.30
4. Step 4: Simplify right side
   1,431.52x = 2,172,613.66
5. Step 5: Solve for x
   x = 2,172,613.66/1,431.52
6. Step 6: Final answer
   x = 1,517.70