Finding the Fourth Proportional to 3,638.86, 5,021.60 and 2,146.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,638.86 : 5,021.60 = 2,146.78 : x
2. Step 2: Convert to fraction form
   3,638.86/5,021.60 = 2,146.78/x
3. Step 3: Cross multiply
   3,638.86x = 5,021.60 × 2,146.78
4. Step 4: Simplify right side
   3,638.86x = 10,780,270.45
5. Step 5: Solve for x
   x = 10,780,270.45/3,638.86
6. Step 6: Final answer
   x = 2,962.54