Finding the Fourth Proportional to 28,538.28, 42,809.94 and 7,478.28

Step by Step Solution

1. Step 1: Write the proportion equation
   28,538.28 : 42,809.94 = 7,478.28 : x
2. Step 2: Convert to fraction form
   28,538.28/42,809.94 = 7,478.28/x
3. Step 3: Cross multiply
   28,538.28x = 42,809.94 × 7,478.28
4. Step 4: Simplify right side
   28,538.28x = 320,144,718.10
5. Step 5: Solve for x
   x = 320,144,718.10/28,538.28
6. Step 6: Final answer
   x = 11,218.08