Finding the Fourth Proportional to 9,407.05, 12,981.54 and 5,428.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.05 : 12,981.54 = 5,428.06 : x
2. Step 2: Convert to fraction form
   9,407.05/12,981.54 = 5,428.06/x
3. Step 3: Cross multiply
   9,407.05x = 12,981.54 × 5,428.06
4. Step 4: Simplify right side
   9,407.05x = 70,464,578.01
5. Step 5: Solve for x
   x = 70,464,578.01/9,407.05
6. Step 6: Final answer
   x = 7,490.61