Finding the Fourth Proportional to 1,580.90, 2,180.72 and 950.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,580.90 : 2,180.72 = 950.99 : x
2. Step 2: Convert to fraction form
   1,580.90/2,180.72 = 950.99/x
3. Step 3: Cross multiply
   1,580.90x = 2,180.72 × 950.99
4. Step 4: Simplify right side
   1,580.90x = 2,073,834.39
5. Step 5: Solve for x
   x = 2,073,834.39/1,580.90
6. Step 6: Final answer
   x = 1,311.81