Finding the Fourth Proportional to 28,389.50, 42,584.40 and 7,328.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,389.50 : 42,584.40 = 7,328.10 : x
2. Step 2: Convert to fraction form
   28,389.50/42,584.40 = 7,328.10/x
3. Step 3: Cross multiply
   28,389.50x = 42,584.40 × 7,328.10
4. Step 4: Simplify right side
   28,389.50x = 312,062,581.95
5. Step 5: Solve for x
   x = 312,062,581.95/28,389.50
6. Step 6: Final answer
   x = 10,992.19