Finding the Fourth Proportional to 1,390.56, 1,919.76 and 925.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.56 : 1,919.76 = 925.44 : x
2. Step 2: Convert to fraction form
   1,390.56/1,919.76 = 925.44/x
3. Step 3: Cross multiply
   1,390.56x = 1,919.76 × 925.44
4. Step 4: Simplify right side
   1,390.56x = 1,776,622.69
5. Step 5: Solve for x
   x = 1,776,622.69/1,390.56
6. Step 6: Final answer
   x = 1,277.63