Finding the Fourth Proportional to 1,155.72, 1,733.06 and 425.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.72 : 1,733.06 = 425.30 : x
2. Step 2: Convert to fraction form
   1,155.72/1,733.06 = 425.30/x
3. Step 3: Cross multiply
   1,155.72x = 1,733.06 × 425.30
4. Step 4: Simplify right side
   1,155.72x = 737,059.63
5. Step 5: Solve for x
   x = 737,059.63/1,155.72
6. Step 6: Final answer
   x = 637.75