Finding the Fourth Proportional to 2,190.69, 3,291.72 and 1,647.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,190.69 : 3,291.72 = 1,647.99 : x
2. Step 2: Convert to fraction form
   2,190.69/3,291.72 = 1,647.99/x
3. Step 3: Cross multiply
   2,190.69x = 3,291.72 × 1,647.99
4. Step 4: Simplify right side
   2,190.69x = 5,424,721.64
5. Step 5: Solve for x
   x = 5,424,721.64/2,190.69
6. Step 6: Final answer
   x = 2,476.26