Finding the Fourth Proportional to 2,196.60, 3,294.78 and 553.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.60 : 3,294.78 = 553.10 : x
2. Step 2: Convert to fraction form
   2,196.60/3,294.78 = 553.10/x
3. Step 3: Cross multiply
   2,196.60x = 3,294.78 × 553.10
4. Step 4: Simplify right side
   2,196.60x = 1,822,342.82
5. Step 5: Solve for x
   x = 1,822,342.82/2,196.60
6. Step 6: Final answer
   x = 829.62