Finding the Fourth Proportional to 2,172.36, 3,254.88 and 872.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.36 : 3,254.88 = 872.31 : x
2. Step 2: Convert to fraction form
   2,172.36/3,254.88 = 872.31/x
3. Step 3: Cross multiply
   2,172.36x = 3,254.88 × 872.31
4. Step 4: Simplify right side
   2,172.36x = 2,839,264.37
5. Step 5: Solve for x
   x = 2,839,264.37/2,172.36
6. Step 6: Final answer
   x = 1,307.00