Finding the Fourth Proportional to 1,520.10, 2,097.73 and 821.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.10 : 2,097.73 = 821.47 : x
2. Step 2: Convert to fraction form
   1,520.10/2,097.73 = 821.47/x
3. Step 3: Cross multiply
   1,520.10x = 2,097.73 × 821.47
4. Step 4: Simplify right side
   1,520.10x = 1,723,222.26
5. Step 5: Solve for x
   x = 1,723,222.26/1,520.10
6. Step 6: Final answer
   x = 1,133.63