Finding the Fourth Proportional to 2,387.81, 3,581.56 and 1,420.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,387.81 : 3,581.56 = 1,420.07 : x
2. Step 2: Convert to fraction form
   2,387.81/3,581.56 = 1,420.07/x
3. Step 3: Cross multiply
   2,387.81x = 3,581.56 × 1,420.07
4. Step 4: Simplify right side
   2,387.81x = 5,086,065.91
5. Step 5: Solve for x
   x = 5,086,065.91/2,387.81
6. Step 6: Final answer
   x = 2,130.01