Finding the Fourth Proportional to 1,466.72, 2,199.72 and 426.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,466.72 : 2,199.72 = 426.72 : x
2. Step 2: Convert to fraction form
   1,466.72/2,199.72 = 426.72/x
3. Step 3: Cross multiply
   1,466.72x = 2,199.72 × 426.72
4. Step 4: Simplify right side
   1,466.72x = 938,664.52
5. Step 5: Solve for x
   x = 938,664.52/1,466.72
6. Step 6: Final answer
   x = 639.98