Finding the Fourth Proportional to 2,688.72, 3,712.20 and 2,070.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.72 : 3,712.20 = 2,070.48 : x
2. Step 2: Convert to fraction form
   2,688.72/3,712.20 = 2,070.48/x
3. Step 3: Cross multiply
   2,688.72x = 3,712.20 × 2,070.48
4. Step 4: Simplify right side
   2,688.72x = 7,686,035.86
5. Step 5: Solve for x
   x = 7,686,035.86/2,688.72
6. Step 6: Final answer
   x = 2,858.62