Finding the Fourth Proportional to 9,407.60, 12,984.12 and 5,428.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.60 : 12,984.12 = 5,428.04 : x
2. Step 2: Convert to fraction form
   9,407.60/12,984.12 = 5,428.04/x
3. Step 3: Cross multiply
   9,407.60x = 12,984.12 × 5,428.04
4. Step 4: Simplify right side
   9,407.60x = 70,478,322.72
5. Step 5: Solve for x
   x = 70,478,322.72/9,407.60
6. Step 6: Final answer
   x = 7,491.64