Finding the Fourth Proportional to 3,377.42, 5,061.36 and 1,991.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,377.42 : 5,061.36 = 1,991.06 : x
2. Step 2: Convert to fraction form
   3,377.42/5,061.36 = 1,991.06/x
3. Step 3: Cross multiply
   3,377.42x = 5,061.36 × 1,991.06
4. Step 4: Simplify right side
   3,377.42x = 10,077,471.44
5. Step 5: Solve for x
   x = 10,077,471.44/3,377.42
6. Step 6: Final answer
   x = 2,983.78