Finding the Fourth Proportional to 2,428.91, 3,647.01 and 1,390.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,428.91 : 3,647.01 = 1,390.08 : x
2. Step 2: Convert to fraction form
   2,428.91/3,647.01 = 1,390.08/x
3. Step 3: Cross multiply
   2,428.91x = 3,647.01 × 1,390.08
4. Step 4: Simplify right side
   2,428.91x = 5,069,628.71
5. Step 5: Solve for x
   x = 5,069,628.71/2,428.91
6. Step 6: Final answer
   x = 2,087.21