Finding the Fourth Proportional to 1,222.17, 1,832.38 and 572.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.17 : 1,832.38 = 572.55 : x
2. Step 2: Convert to fraction form
   1,222.17/1,832.38 = 572.55/x
3. Step 3: Cross multiply
   1,222.17x = 1,832.38 × 572.55
4. Step 4: Simplify right side
   1,222.17x = 1,049,129.17
5. Step 5: Solve for x
   x = 1,049,129.17/1,222.17
6. Step 6: Final answer
   x = 858.42