Finding the Fourth Proportional to 9,407.84, 12,981.12 and 5,429.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.84 : 12,981.12 = 5,429.12 : x
2. Step 2: Convert to fraction form
   9,407.84/12,981.12 = 5,429.12/x
3. Step 3: Cross multiply
   9,407.84x = 12,981.12 × 5,429.12
4. Step 4: Simplify right side
   9,407.84x = 70,476,058.21
5. Step 5: Solve for x
   x = 70,476,058.21/9,407.84
6. Step 6: Final answer
   x = 7,491.21