Finding the Fourth Proportional to 1,372.38, 1,892.79 and 906.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.38 : 1,892.79 = 906.78 : x
2. Step 2: Convert to fraction form
   1,372.38/1,892.79 = 906.78/x
3. Step 3: Cross multiply
   1,372.38x = 1,892.79 × 906.78
4. Step 4: Simplify right side
   1,372.38x = 1,716,344.12
5. Step 5: Solve for x
   x = 1,716,344.12/1,372.38
6. Step 6: Final answer
   x = 1,250.63