Finding the Fourth Proportional to 1,378.48, 1,901.72 and 906.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.48 : 1,901.72 = 906.56 : x
2. Step 2: Convert to fraction form
   1,378.48/1,901.72 = 906.56/x
3. Step 3: Cross multiply
   1,378.48x = 1,901.72 × 906.56
4. Step 4: Simplify right side
   1,378.48x = 1,724,023.28
5. Step 5: Solve for x
   x = 1,724,023.28/1,378.48
6. Step 6: Final answer
   x = 1,250.67