Finding the Fourth Proportional to 2,116.47, 2,920.71 and 1,172.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.47 : 2,920.71 = 1,172.27 : x
2. Step 2: Convert to fraction form
   2,116.47/2,920.71 = 1,172.27/x
3. Step 3: Cross multiply
   2,116.47x = 2,920.71 × 1,172.27
4. Step 4: Simplify right side
   2,116.47x = 3,423,846.11
5. Step 5: Solve for x
   x = 3,423,846.11/2,116.47
6. Step 6: Final answer
   x = 1,617.72