Finding the Fourth Proportional to 1,817.47, 2,507.25 and 1,228.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,817.47 : 2,507.25 = 1,228.20 : x
2. Step 2: Convert to fraction form
   1,817.47/2,507.25 = 1,228.20/x
3. Step 3: Cross multiply
   1,817.47x = 2,507.25 × 1,228.20
4. Step 4: Simplify right side
   1,817.47x = 3,079,404.45
5. Step 5: Solve for x
   x = 3,079,404.45/1,817.47
6. Step 6: Final answer
   x = 1,694.34