Finding the Fourth Proportional to 2,200.52, 3,300.72 and 813.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,200.52 : 3,300.72 = 813.30 : x
2. Step 2: Convert to fraction form
   2,200.52/3,300.72 = 813.30/x
3. Step 3: Cross multiply
   2,200.52x = 3,300.72 × 813.30
4. Step 4: Simplify right side
   2,200.52x = 2,684,460.15
5. Step 5: Solve for x
   x = 2,684,460.15/2,200.52
6. Step 6: Final answer
   x = 1,219.92