Finding the Fourth Proportional to 1,428.69, 2,142.49 and 607.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.69 : 2,142.49 = 607.35 : x
2. Step 2: Convert to fraction form
   1,428.69/2,142.49 = 607.35/x
3. Step 3: Cross multiply
   1,428.69x = 2,142.49 × 607.35
4. Step 4: Simplify right side
   1,428.69x = 1,301,241.30
5. Step 5: Solve for x
   x = 1,301,241.30/1,428.69
6. Step 6: Final answer
   x = 910.79