Finding the Fourth Proportional to 1,381.94, 1,906.98 and 1,087.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.94 : 1,906.98 = 1,087.92 : x
2. Step 2: Convert to fraction form
   1,381.94/1,906.98 = 1,087.92/x
3. Step 3: Cross multiply
   1,381.94x = 1,906.98 × 1,087.92
4. Step 4: Simplify right side
   1,381.94x = 2,074,641.68
5. Step 5: Solve for x
   x = 2,074,641.68/1,381.94
6. Step 6: Final answer
   x = 1,501.25