Finding the Fourth Proportional to 1,406.28, 1,938.33 and 1,288.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.28 : 1,938.33 = 1,288.62 : x
2. Step 2: Convert to fraction form
   1,406.28/1,938.33 = 1,288.62/x
3. Step 3: Cross multiply
   1,406.28x = 1,938.33 × 1,288.62
4. Step 4: Simplify right side
   1,406.28x = 2,497,770.80
5. Step 5: Solve for x
   x = 2,497,770.80/1,406.28
6. Step 6: Final answer
   x = 1,776.15