Finding the Fourth Proportional to 1,377.12, 1,900.32 and 817.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.12 : 1,900.32 = 817.48 : x
2. Step 2: Convert to fraction form
   1,377.12/1,900.32 = 817.48/x
3. Step 3: Cross multiply
   1,377.12x = 1,900.32 × 817.48
4. Step 4: Simplify right side
   1,377.12x = 1,553,473.59
5. Step 5: Solve for x
   x = 1,553,473.59/1,377.12
6. Step 6: Final answer
   x = 1,128.06