Finding the Fourth Proportional to 1,428.37, 2,142.72 and 606.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.37 : 2,142.72 = 606.18 : x
2. Step 2: Convert to fraction form
   1,428.37/2,142.72 = 606.18/x
3. Step 3: Cross multiply
   1,428.37x = 2,142.72 × 606.18
4. Step 4: Simplify right side
   1,428.37x = 1,298,882.04
5. Step 5: Solve for x
   x = 1,298,882.04/1,428.37
6. Step 6: Final answer
   x = 909.35