Finding the Fourth Proportional to 9,003.28, 12,428.58 and 5,419.84

Step by Step Solution

1. Step 1: Write the proportion equation
   9,003.28 : 12,428.58 = 5,419.84 : x
2. Step 2: Convert to fraction form
   9,003.28/12,428.58 = 5,419.84/x
3. Step 3: Cross multiply
   9,003.28x = 12,428.58 × 5,419.84
4. Step 4: Simplify right side
   9,003.28x = 67,360,915.03
5. Step 5: Solve for x
   x = 67,360,915.03/9,003.28
6. Step 6: Final answer
   x = 7,481.82