Finding the Fourth Proportional to 1,807.20, 2,711.94 and 985.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,807.20 : 2,711.94 = 985.99 : x
2. Step 2: Convert to fraction form
   1,807.20/2,711.94 = 985.99/x
3. Step 3: Cross multiply
   1,807.20x = 2,711.94 × 985.99
4. Step 4: Simplify right side
   1,807.20x = 2,673,945.72
5. Step 5: Solve for x
   x = 2,673,945.72/1,807.20
6. Step 6: Final answer
   x = 1,479.61