Finding the Fourth Proportional to 2,685.34, 4,020.72 and 2,670.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,685.34 : 4,020.72 = 2,670.76 : x
2. Step 2: Convert to fraction form
   2,685.34/4,020.72 = 2,670.76/x
3. Step 3: Cross multiply
   2,685.34x = 4,020.72 × 2,670.76
4. Step 4: Simplify right side
   2,685.34x = 10,738,378.15
5. Step 5: Solve for x
   x = 10,738,378.15/2,685.34
6. Step 6: Final answer
   x = 3,998.89