Finding the Fourth Proportional to 1,381.93, 1,906.32 and 910.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.93 : 1,906.32 = 910.15 : x
2. Step 2: Convert to fraction form
   1,381.93/1,906.32 = 910.15/x
3. Step 3: Cross multiply
   1,381.93x = 1,906.32 × 910.15
4. Step 4: Simplify right side
   1,381.93x = 1,735,037.15
5. Step 5: Solve for x
   x = 1,735,037.15/1,381.93
6. Step 6: Final answer
   x = 1,255.52