Finding the Fourth Proportional to 9,410.94, 12,986.46 and 5,428.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,410.94 : 12,986.46 = 5,428.98 : x
2. Step 2: Convert to fraction form
   9,410.94/12,986.46 = 5,428.98/x
3. Step 3: Cross multiply
   9,410.94x = 12,986.46 × 5,428.98
4. Step 4: Simplify right side
   9,410.94x = 70,503,231.61
5. Step 5: Solve for x
   x = 70,503,231.61/9,410.94
6. Step 6: Final answer
   x = 7,491.62