Finding the Fourth Proportional to 3,942.15, 5,903.48 and 2,551.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,942.15 : 5,903.48 = 2,551.21 : x
2. Step 2: Convert to fraction form
   3,942.15/5,903.48 = 2,551.21/x
3. Step 3: Cross multiply
   3,942.15x = 5,903.48 × 2,551.21
4. Step 4: Simplify right side
   3,942.15x = 15,061,008.83
5. Step 5: Solve for x
   x = 15,061,008.83/3,942.15
6. Step 6: Final answer
   x = 3,820.51