Finding the Fourth Proportional to 2,063.90, 3,099.32 and 1,285.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,063.90 : 3,099.32 = 1,285.72 : x
2. Step 2: Convert to fraction form
   2,063.90/3,099.32 = 1,285.72/x
3. Step 3: Cross multiply
   2,063.90x = 3,099.32 × 1,285.72
4. Step 4: Simplify right side
   2,063.90x = 3,984,857.71
5. Step 5: Solve for x
   x = 3,984,857.71/2,063.90
6. Step 6: Final answer
   x = 1,930.74