Finding the Fourth Proportional to 1,579.31, 2,180.31 and 949.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,579.31 : 2,180.31 = 949.99 : x
2. Step 2: Convert to fraction form
   1,579.31/2,180.31 = 949.99/x
3. Step 3: Cross multiply
   1,579.31x = 2,180.31 × 949.99
4. Step 4: Simplify right side
   1,579.31x = 2,071,272.70
5. Step 5: Solve for x
   x = 2,071,272.70/1,579.31
6. Step 6: Final answer
   x = 1,311.50