Finding the Fourth Proportional to 9,407.46, 12,981.78 and 5,428.35

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.46 : 12,981.78 = 5,428.35 : x
2. Step 2: Convert to fraction form
   9,407.46/12,981.78 = 5,428.35/x
3. Step 3: Cross multiply
   9,407.46x = 12,981.78 × 5,428.35
4. Step 4: Simplify right side
   9,407.46x = 70,469,645.46
5. Step 5: Solve for x
   x = 70,469,645.46/9,407.46
6. Step 6: Final answer
   x = 7,490.83