Finding the Fourth Proportional to 1,940.72, 2,911.58 and 1,247.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,940.72 : 2,911.58 = 1,247.72 : x
2. Step 2: Convert to fraction form
   1,940.72/2,911.58 = 1,247.72/x
3. Step 3: Cross multiply
   1,940.72x = 2,911.58 × 1,247.72
4. Step 4: Simplify right side
   1,940.72x = 3,632,815.80
5. Step 5: Solve for x
   x = 3,632,815.80/1,940.72
6. Step 6: Final answer
   x = 1,871.90