Finding the Fourth Proportional to 2,102.72, 3,152.28 and 805.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,102.72 : 3,152.28 = 805.12 : x
2. Step 2: Convert to fraction form
   2,102.72/3,152.28 = 805.12/x
3. Step 3: Cross multiply
   2,102.72x = 3,152.28 × 805.12
4. Step 4: Simplify right side
   2,102.72x = 2,537,963.67
5. Step 5: Solve for x
   x = 2,537,963.67/2,102.72
6. Step 6: Final answer
   x = 1,206.99