Finding the Fourth Proportional to 28,488.48, 42,728.75 and 7,426.82

Step by Step Solution

1. Step 1: Write the proportion equation
   28,488.48 : 42,728.75 = 7,426.82 : x
2. Step 2: Convert to fraction form
   28,488.48/42,728.75 = 7,426.82/x
3. Step 3: Cross multiply
   28,488.48x = 42,728.75 × 7,426.82
4. Step 4: Simplify right side
   28,488.48x = 317,338,832.61
5. Step 5: Solve for x
   x = 317,338,832.61/28,488.48
6. Step 6: Final answer
   x = 11,139.20