Finding the Fourth Proportional to 2,116.34, 2,920.46 and 1,172.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.34 : 2,920.46 = 1,172.07 : x
2. Step 2: Convert to fraction form
   2,116.34/2,920.46 = 1,172.07/x
3. Step 3: Cross multiply
   2,116.34x = 2,920.46 × 1,172.07
4. Step 4: Simplify right side
   2,116.34x = 3,422,977.69
5. Step 5: Solve for x
   x = 3,422,977.69/2,116.34
6. Step 6: Final answer
   x = 1,617.40