Finding the Fourth Proportional to 1,485.52, 2,229.42 and 561.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.52 : 2,229.42 = 561.30 : x
2. Step 2: Convert to fraction form
   1,485.52/2,229.42 = 561.30/x
3. Step 3: Cross multiply
   1,485.52x = 2,229.42 × 561.30
4. Step 4: Simplify right side
   1,485.52x = 1,251,373.45
5. Step 5: Solve for x
   x = 1,251,373.45/1,485.52
6. Step 6: Final answer
   x = 842.38