Finding the Fourth Proportional to 9,890.87, 13,649.72 and 5,414.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,890.87 : 13,649.72 = 5,414.94 : x
2. Step 2: Convert to fraction form
   9,890.87/13,649.72 = 5,414.94/x
3. Step 3: Cross multiply
   9,890.87x = 13,649.72 × 5,414.94
4. Step 4: Simplify right side
   9,890.87x = 73,912,387.74
5. Step 5: Solve for x
   x = 73,912,387.74/9,890.87
6. Step 6: Final answer
   x = 7,472.79