Finding the Fourth Proportional to 1,377.38, 1,899.95 and 817.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.38 : 1,899.95 = 817.47 : x
2. Step 2: Convert to fraction form
   1,377.38/1,899.95 = 817.47/x
3. Step 3: Cross multiply
   1,377.38x = 1,899.95 × 817.47
4. Step 4: Simplify right side
   1,377.38x = 1,553,148.04
5. Step 5: Solve for x
   x = 1,553,148.04/1,377.38
6. Step 6: Final answer
   x = 1,127.61