Finding the Fourth Proportional to 42,387.28, 63,464.04 and 28,327.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,387.28 : 63,464.04 = 28,327.91 : x
2. Step 2: Convert to fraction form
   42,387.28/63,464.04 = 28,327.91/x
3. Step 3: Cross multiply
   42,387.28x = 63,464.04 × 28,327.91
4. Step 4: Simplify right side
   42,387.28x = 1,797,803,296.04
5. Step 5: Solve for x
   x = 1,797,803,296.04/42,387.28
6. Step 6: Final answer
   x = 42,413.75