Finding the Fourth Proportional to 2,116.48, 2,920.75 and 1,172.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.48 : 2,920.75 = 1,172.30 : x
2. Step 2: Convert to fraction form
   2,116.48/2,920.75 = 1,172.30/x
3. Step 3: Cross multiply
   2,116.48x = 2,920.75 × 1,172.30
4. Step 4: Simplify right side
   2,116.48x = 3,423,974.76
5. Step 5: Solve for x
   x = 3,423,974.76/2,116.48
6. Step 6: Final answer
   x = 1,617.77