Finding the Fourth Proportional to 2,353.86, 3,531.20 and 814.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,353.86 : 3,531.20 = 814.50 : x
2. Step 2: Convert to fraction form
   2,353.86/3,531.20 = 814.50/x
3. Step 3: Cross multiply
   2,353.86x = 3,531.20 × 814.50
4. Step 4: Simplify right side
   2,353.86x = 2,876,162.40
5. Step 5: Solve for x
   x = 2,876,162.40/2,353.86
6. Step 6: Final answer
   x = 1,221.89