Finding the Fourth Proportional to 2,009.31, 3,008.78 and 1,386.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,009.31 : 3,008.78 = 1,386.53 : x
2. Step 2: Convert to fraction form
   2,009.31/3,008.78 = 1,386.53/x
3. Step 3: Cross multiply
   2,009.31x = 3,008.78 × 1,386.53
4. Step 4: Simplify right side
   2,009.31x = 4,171,756.80
5. Step 5: Solve for x
   x = 4,171,756.80/2,009.31
6. Step 6: Final answer
   x = 2,076.21