Finding the Fourth Proportional to 1,399.53, 1,930.78 and 902.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.53 : 1,930.78 = 902.46 : x
2. Step 2: Convert to fraction form
   1,399.53/1,930.78 = 902.46/x
3. Step 3: Cross multiply
   1,399.53x = 1,930.78 × 902.46
4. Step 4: Simplify right side
   1,399.53x = 1,742,451.72
5. Step 5: Solve for x
   x = 1,742,451.72/1,399.53
6. Step 6: Final answer
   x = 1,245.03