Finding the Fourth Proportional to 2,172.91, 3,259.57 and 712.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.91 : 3,259.57 = 712.07 : x
2. Step 2: Convert to fraction form
   2,172.91/3,259.57 = 712.07/x
3. Step 3: Cross multiply
   2,172.91x = 3,259.57 × 712.07
4. Step 4: Simplify right side
   2,172.91x = 2,321,042.01
5. Step 5: Solve for x
   x = 2,321,042.01/2,172.91
6. Step 6: Final answer
   x = 1,068.17