Finding the Fourth Proportional to 1,376.78, 1,900.10 and 817.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.78 : 1,900.10 = 817.34 : x
2. Step 2: Convert to fraction form
   1,376.78/1,900.10 = 817.34/x
3. Step 3: Cross multiply
   1,376.78x = 1,900.10 × 817.34
4. Step 4: Simplify right side
   1,376.78x = 1,553,027.73
5. Step 5: Solve for x
   x = 1,553,027.73/1,376.78
6. Step 6: Final answer
   x = 1,128.01