Finding the Fourth Proportional to 3,716.06, 5,128.47 and 2,123.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,716.06 : 5,128.47 = 2,123.20 : x
2. Step 2: Convert to fraction form
   3,716.06/5,128.47 = 2,123.20/x
3. Step 3: Cross multiply
   3,716.06x = 5,128.47 × 2,123.20
4. Step 4: Simplify right side
   3,716.06x = 10,888,767.50
5. Step 5: Solve for x
   x = 10,888,767.50/3,716.06
6. Step 6: Final answer
   x = 2,930.19