Finding the Fourth Proportional to 3,991.57, 5,496.47 and 3,903.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.57 : 5,496.47 = 3,903.06 : x
2. Step 2: Convert to fraction form
   3,991.57/5,496.47 = 3,903.06/x
3. Step 3: Cross multiply
   3,991.57x = 5,496.47 × 3,903.06
4. Step 4: Simplify right side
   3,991.57x = 21,453,052.20
5. Step 5: Solve for x
   x = 21,453,052.20/3,991.57
6. Step 6: Final answer
   x = 5,374.59