Finding the Fourth Proportional to 1,813.17, 2,500.57 and 1,224.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,813.17 : 2,500.57 = 1,224.50 : x
2. Step 2: Convert to fraction form
   1,813.17/2,500.57 = 1,224.50/x
3. Step 3: Cross multiply
   1,813.17x = 2,500.57 × 1,224.50
4. Step 4: Simplify right side
   1,813.17x = 3,061,951.16
5. Step 5: Solve for x
   x = 3,061,951.16/1,813.17
6. Step 6: Final answer
   x = 1,688.73