Finding the Fourth Proportional to 1,972.69, 2,722.17 and 1,187.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,972.69 : 2,722.17 = 1,187.17 : x
2. Step 2: Convert to fraction form
   1,972.69/2,722.17 = 1,187.17/x
3. Step 3: Cross multiply
   1,972.69x = 2,722.17 × 1,187.17
4. Step 4: Simplify right side
   1,972.69x = 3,231,678.56
5. Step 5: Solve for x
   x = 3,231,678.56/1,972.69
6. Step 6: Final answer
   x = 1,638.21