Finding the Fourth Proportional to 1,899.79, 2,620.68 and 1,806.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,899.79 : 2,620.68 = 1,806.50 : x
2. Step 2: Convert to fraction form
   1,899.79/2,620.68 = 1,806.50/x
3. Step 3: Cross multiply
   1,899.79x = 2,620.68 × 1,806.50
4. Step 4: Simplify right side
   1,899.79x = 4,734,258.42
5. Step 5: Solve for x
   x = 4,734,258.42/1,899.79
6. Step 6: Final answer
   x = 2,491.99