Finding the Fourth Proportional to 1,376.78, 1,900.01 and 817.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.78 : 1,900.01 = 817.55 : x
2. Step 2: Convert to fraction form
   1,376.78/1,900.01 = 817.55/x
3. Step 3: Cross multiply
   1,376.78x = 1,900.01 × 817.55
4. Step 4: Simplify right side
   1,376.78x = 1,553,345.72
5. Step 5: Solve for x
   x = 1,553,345.72/1,376.78
6. Step 6: Final answer
   x = 1,128.24