Finding the Fourth Proportional to 1,815.49, 2,507.42 and 1,225

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.49 : 2,507.42 = 1,225 : x
2. Step 2: Convert to fraction form
   1,815.49/2,507.42 = 1,225/x
3. Step 3: Cross multiply
   1,815.49x = 2,507.42 × 1,225
4. Step 4: Simplify right side
   1,815.49x = 3,071,589.50
5. Step 5: Solve for x
   x = 3,071,589.50/1,815.49
6. Step 6: Final answer
   x = 1,691.88