Finding the Fourth Proportional to 2,099.31, 2,898.53 and 1,392.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.31 : 2,898.53 = 1,392.63 : x
2. Step 2: Convert to fraction form
   2,099.31/2,898.53 = 1,392.63/x
3. Step 3: Cross multiply
   2,099.31x = 2,898.53 × 1,392.63
4. Step 4: Simplify right side
   2,099.31x = 4,036,574.74
5. Step 5: Solve for x
   x = 4,036,574.74/2,099.31
6. Step 6: Final answer
   x = 1,922.81