Finding the Fourth Proportional to 2,101.78, 3,148.31 and 1,776.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.78 : 3,148.31 = 1,776.01 : x
2. Step 2: Convert to fraction form
   2,101.78/3,148.31 = 1,776.01/x
3. Step 3: Cross multiply
   2,101.78x = 3,148.31 × 1,776.01
4. Step 4: Simplify right side
   2,101.78x = 5,591,405.42
5. Step 5: Solve for x
   x = 5,591,405.42/2,101.78
6. Step 6: Final answer
   x = 2,660.32