Finding the Fourth Proportional to 3,991.50, 5,507.40 and 2,419.29

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.50 : 5,507.40 = 2,419.29 : x
2. Step 2: Convert to fraction form
   3,991.50/5,507.40 = 2,419.29/x
3. Step 3: Cross multiply
   3,991.50x = 5,507.40 × 2,419.29
4. Step 4: Simplify right side
   3,991.50x = 13,323,997.75
5. Step 5: Solve for x
   x = 13,323,997.75/3,991.50
6. Step 6: Final answer
   x = 3,338.09