Finding the Fourth Proportional to 3,555.10, 4,906.72 and 2,139.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,555.10 : 4,906.72 = 2,139.94 : x
2. Step 2: Convert to fraction form
   3,555.10/4,906.72 = 2,139.94/x
3. Step 3: Cross multiply
   3,555.10x = 4,906.72 × 2,139.94
4. Step 4: Simplify right side
   3,555.10x = 10,500,086.40
5. Step 5: Solve for x
   x = 10,500,086.40/3,555.10
6. Step 6: Final answer
   x = 2,953.53