Finding the Fourth Proportional to 1,002.72, 1,504.41 and 905.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.72 : 1,504.41 = 905.67 : x
2. Step 2: Convert to fraction form
   1,002.72/1,504.41 = 905.67/x
3. Step 3: Cross multiply
   1,002.72x = 1,504.41 × 905.67
4. Step 4: Simplify right side
   1,002.72x = 1,362,499.00
5. Step 5: Solve for x
   x = 1,362,499.00/1,002.72
6. Step 6: Final answer
   x = 1,358.80