Finding the Fourth Proportional to 2,912.05, 4,366.31 and 1,308.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,912.05 : 4,366.31 = 1,308.91 : x
2. Step 2: Convert to fraction form
   2,912.05/4,366.31 = 1,308.91/x
3. Step 3: Cross multiply
   2,912.05x = 4,366.31 × 1,308.91
4. Step 4: Simplify right side
   2,912.05x = 5,715,097.55
5. Step 5: Solve for x
   x = 5,715,097.55/2,912.05
6. Step 6: Final answer
   x = 1,962.57