Finding the Fourth Proportional to 3,922.17, 5,412.60 and 2,153.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,922.17 : 5,412.60 = 2,153.89 : x
2. Step 2: Convert to fraction form
   3,922.17/5,412.60 = 2,153.89/x
3. Step 3: Cross multiply
   3,922.17x = 5,412.60 × 2,153.89
4. Step 4: Simplify right side
   3,922.17x = 11,658,145.72
5. Step 5: Solve for x
   x = 11,658,145.72/3,922.17
6. Step 6: Final answer
   x = 2,972.37