Finding the Fourth Proportional to 2,820.50, 3,870.08 and 2,663.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.50 : 3,870.08 = 2,663.76 : x
2. Step 2: Convert to fraction form
   2,820.50/3,870.08 = 2,663.76/x
3. Step 3: Cross multiply
   2,820.50x = 3,870.08 × 2,663.76
4. Step 4: Simplify right side
   2,820.50x = 10,308,964.30
5. Step 5: Solve for x
   x = 10,308,964.30/2,820.50
6. Step 6: Final answer
   x = 3,655.01