Finding the Fourth Proportional to 1,381.15, 1,908.53 and 1,007.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.15 : 1,908.53 = 1,007.50 : x
2. Step 2: Convert to fraction form
   1,381.15/1,908.53 = 1,007.50/x
3. Step 3: Cross multiply
   1,381.15x = 1,908.53 × 1,007.50
4. Step 4: Simplify right side
   1,381.15x = 1,922,843.98
5. Step 5: Solve for x
   x = 1,922,843.98/1,381.15
6. Step 6: Final answer
   x = 1,392.21