Finding the Fourth Proportional to 2,199.60, 3,298.33 and 813.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,199.60 : 3,298.33 = 813.59 : x
2. Step 2: Convert to fraction form
   2,199.60/3,298.33 = 813.59/x
3. Step 3: Cross multiply
   2,199.60x = 3,298.33 × 813.59
4. Step 4: Simplify right side
   2,199.60x = 2,683,488.30
5. Step 5: Solve for x
   x = 2,683,488.30/2,199.60
6. Step 6: Final answer
   x = 1,219.99