Finding the Fourth Proportional to 3,899.82, 5,381.72 and 2,131.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.82 : 5,381.72 = 2,131.42 : x
2. Step 2: Convert to fraction form
   3,899.82/5,381.72 = 2,131.42/x
3. Step 3: Cross multiply
   3,899.82x = 5,381.72 × 2,131.42
4. Step 4: Simplify right side
   3,899.82x = 11,470,705.64
5. Step 5: Solve for x
   x = 11,470,705.64/3,899.82
6. Step 6: Final answer
   x = 2,941.34