Finding the Fourth Proportional to 2,116.02, 3,172.17 and 816.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.02 : 3,172.17 = 816.60 : x
2. Step 2: Convert to fraction form
   2,116.02/3,172.17 = 816.60/x
3. Step 3: Cross multiply
   2,116.02x = 3,172.17 × 816.60
4. Step 4: Simplify right side
   2,116.02x = 2,590,394.02
5. Step 5: Solve for x
   x = 2,590,394.02/2,116.02
6. Step 6: Final answer
   x = 1,224.18