Finding the Fourth Proportional to 1,377.17, 2,063.72 and 1,085.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.17 : 2,063.72 = 1,085.37 : x
2. Step 2: Convert to fraction form
   1,377.17/2,063.72 = 1,085.37/x
3. Step 3: Cross multiply
   1,377.17x = 2,063.72 × 1,085.37
4. Step 4: Simplify right side
   1,377.17x = 2,239,894.35
5. Step 5: Solve for x
   x = 2,239,894.35/1,377.17
6. Step 6: Final answer
   x = 1,626.45