Finding the Fourth Proportional to 1,681.11, 2,536.83 and 1,620.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,681.11 : 2,536.83 = 1,620.09 : x
2. Step 2: Convert to fraction form
   1,681.11/2,536.83 = 1,620.09/x
3. Step 3: Cross multiply
   1,681.11x = 2,536.83 × 1,620.09
4. Step 4: Simplify right side
   1,681.11x = 4,109,892.91
5. Step 5: Solve for x
   x = 4,109,892.91/1,681.11
6. Step 6: Final answer
   x = 2,444.75