Finding the Fourth Proportional to 2,180.85, 3,271.32 and 947.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,180.85 : 3,271.32 = 947.31 : x
2. Step 2: Convert to fraction form
   2,180.85/3,271.32 = 947.31/x
3. Step 3: Cross multiply
   2,180.85x = 3,271.32 × 947.31
4. Step 4: Simplify right side
   2,180.85x = 3,098,954.15
5. Step 5: Solve for x
   x = 3,098,954.15/2,180.85
6. Step 6: Final answer
   x = 1,420.98