Finding the Fourth Proportional to 2,114.02, 3,171.84 and 815.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,114.02 : 3,171.84 = 815.50 : x
2. Step 2: Convert to fraction form
   2,114.02/3,171.84 = 815.50/x
3. Step 3: Cross multiply
   2,114.02x = 3,171.84 × 815.50
4. Step 4: Simplify right side
   2,114.02x = 2,586,635.52
5. Step 5: Solve for x
   x = 2,586,635.52/2,114.02
6. Step 6: Final answer
   x = 1,223.56