Finding the Fourth Proportional to 1,222.20, 1,830.72 and 572.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.20 : 1,830.72 = 572.52 : x
2. Step 2: Convert to fraction form
   1,222.20/1,830.72 = 572.52/x
3. Step 3: Cross multiply
   1,222.20x = 1,830.72 × 572.52
4. Step 4: Simplify right side
   1,222.20x = 1,048,123.81
5. Step 5: Solve for x
   x = 1,048,123.81/1,222.20
6. Step 6: Final answer
   x = 857.57