Finding the Fourth Proportional to 1,501.28, 2,072.02 and 912.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,501.28 : 2,072.02 = 912.20 : x
2. Step 2: Convert to fraction form
   1,501.28/2,072.02 = 912.20/x
3. Step 3: Cross multiply
   1,501.28x = 2,072.02 × 912.20
4. Step 4: Simplify right side
   1,501.28x = 1,890,096.64
5. Step 5: Solve for x
   x = 1,890,096.64/1,501.28
6. Step 6: Final answer
   x = 1,258.99