Finding the Fourth Proportional to 1,212.71, 1,815.62 and 1,097.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.71 : 1,815.62 = 1,097.37 : x
2. Step 2: Convert to fraction form
   1,212.71/1,815.62 = 1,097.37/x
3. Step 3: Cross multiply
   1,212.71x = 1,815.62 × 1,097.37
4. Step 4: Simplify right side
   1,212.71x = 1,992,401.43
5. Step 5: Solve for x
   x = 1,992,401.43/1,212.71
6. Step 6: Final answer
   x = 1,642.94