Finding the Fourth Proportional to 3,991.68, 5,507.46 and 2,499.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.68 : 5,507.46 = 2,499.12 : x
2. Step 2: Convert to fraction form
   3,991.68/5,507.46 = 2,499.12/x
3. Step 3: Cross multiply
   3,991.68x = 5,507.46 × 2,499.12
4. Step 4: Simplify right side
   3,991.68x = 13,763,803.44
5. Step 5: Solve for x
   x = 13,763,803.44/3,991.68
6. Step 6: Final answer
   x = 3,448.12