Finding the Fourth Proportional to 2,069.48, 3,099.76 and 972.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.48 : 3,099.76 = 972.20 : x
2. Step 2: Convert to fraction form
   2,069.48/3,099.76 = 972.20/x
3. Step 3: Cross multiply
   2,069.48x = 3,099.76 × 972.20
4. Step 4: Simplify right side
   2,069.48x = 3,013,586.67
5. Step 5: Solve for x
   x = 3,013,586.67/2,069.48
6. Step 6: Final answer
   x = 1,456.20