Finding the Fourth Proportional to 1,376.89, 1,900.14 and 817.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.89 : 1,900.14 = 817.80 : x
2. Step 2: Convert to fraction form
   1,376.89/1,900.14 = 817.80/x
3. Step 3: Cross multiply
   1,376.89x = 1,900.14 × 817.80
4. Step 4: Simplify right side
   1,376.89x = 1,553,934.49
5. Step 5: Solve for x
   x = 1,553,934.49/1,376.89
6. Step 6: Final answer
   x = 1,128.58