Finding the Fourth Proportional to 1,213.52, 1,816.24 and 1,105.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,213.52 : 1,816.24 = 1,105.60 : x
2. Step 2: Convert to fraction form
   1,213.52/1,816.24 = 1,105.60/x
3. Step 3: Cross multiply
   1,213.52x = 1,816.24 × 1,105.60
4. Step 4: Simplify right side
   1,213.52x = 2,008,034.94
5. Step 5: Solve for x
   x = 2,008,034.94/1,213.52
6. Step 6: Final answer
   x = 1,654.72