Finding the Fourth Proportional to 1,381.65, 1,906.51 and 934.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.65 : 1,906.51 = 934.50 : x
2. Step 2: Convert to fraction form
   1,381.65/1,906.51 = 934.50/x
3. Step 3: Cross multiply
   1,381.65x = 1,906.51 × 934.50
4. Step 4: Simplify right side
   1,381.65x = 1,781,619.39
5. Step 5: Solve for x
   x = 1,781,619.39/1,381.65
6. Step 6: Final answer
   x = 1,289.49