Finding the Fourth Proportional to 3,513.72, 4,848.78 and 2,116.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,513.72 : 4,848.78 = 2,116.20 : x
2. Step 2: Convert to fraction form
   3,513.72/4,848.78 = 2,116.20/x
3. Step 3: Cross multiply
   3,513.72x = 4,848.78 × 2,116.20
4. Step 4: Simplify right side
   3,513.72x = 10,260,988.24
5. Step 5: Solve for x
   x = 10,260,988.24/3,513.72
6. Step 6: Final answer
   x = 2,920.26