Finding the Fourth Proportional to 1,399.72, 1,930.51 and 902.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.72 : 1,930.51 = 902.41 : x
2. Step 2: Convert to fraction form
   1,399.72/1,930.51 = 902.41/x
3. Step 3: Cross multiply
   1,399.72x = 1,930.51 × 902.41
4. Step 4: Simplify right side
   1,399.72x = 1,742,111.53
5. Step 5: Solve for x
   x = 1,742,111.53/1,399.72
6. Step 6: Final answer
   x = 1,244.61