Finding the Fourth Proportional to 28,468.52, 39,264.71 and 21,776.30

Step by Step Solution

1. Step 1: Write the proportion equation
   28,468.52 : 39,264.71 = 21,776.30 : x
2. Step 2: Convert to fraction form
   28,468.52/39,264.71 = 21,776.30/x
3. Step 3: Cross multiply
   28,468.52x = 39,264.71 × 21,776.30
4. Step 4: Simplify right side
   28,468.52x = 855,040,104.37
5. Step 5: Solve for x
   x = 855,040,104.37/28,468.52
6. Step 6: Final answer
   x = 30,034.58