Finding the Fourth Proportional to 2,141.76, 3,210.20 and 1,620.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.76 : 3,210.20 = 1,620.06 : x
2. Step 2: Convert to fraction form
   2,141.76/3,210.20 = 1,620.06/x
3. Step 3: Cross multiply
   2,141.76x = 3,210.20 × 1,620.06
4. Step 4: Simplify right side
   2,141.76x = 5,200,716.61
5. Step 5: Solve for x
   x = 5,200,716.61/2,141.76
6. Step 6: Final answer
   x = 2,428.24