Finding the Fourth Proportional to 3,940.34, 5,437.98 and 2,172.26

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940.34 : 5,437.98 = 2,172.26 : x
2. Step 2: Convert to fraction form
   3,940.34/5,437.98 = 2,172.26/x
3. Step 3: Cross multiply
   3,940.34x = 5,437.98 × 2,172.26
4. Step 4: Simplify right side
   3,940.34x = 11,812,706.43
5. Step 5: Solve for x
   x = 11,812,706.43/3,940.34
6. Step 6: Final answer
   x = 2,997.89