Finding the Fourth Proportional to 1,809.99, 2,499.83 and 1,219.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,809.99 : 2,499.83 = 1,219.50 : x
2. Step 2: Convert to fraction form
   1,809.99/2,499.83 = 1,219.50/x
3. Step 3: Cross multiply
   1,809.99x = 2,499.83 × 1,219.50
4. Step 4: Simplify right side
   1,809.99x = 3,048,541.16
5. Step 5: Solve for x
   x = 3,048,541.16/1,809.99
6. Step 6: Final answer
   x = 1,684.29