Finding the Fourth Proportional to 3,897.30, 5,378.76 and 2,219.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,897.30 : 5,378.76 = 2,219.12 : x
2. Step 2: Convert to fraction form
   3,897.30/5,378.76 = 2,219.12/x
3. Step 3: Cross multiply
   3,897.30x = 5,378.76 × 2,219.12
4. Step 4: Simplify right side
   3,897.30x = 11,936,113.89
5. Step 5: Solve for x
   x = 11,936,113.89/3,897.30
6. Step 6: Final answer
   x = 3,062.66