Finding the Fourth Proportional to 56,067.12, 77,371.20 and 30,915

Step by Step Solution

1. Step 1: Write the proportion equation
   56,067.12 : 77,371.20 = 30,915 : x
2. Step 2: Convert to fraction form
   56,067.12/77,371.20 = 30,915/x
3. Step 3: Cross multiply
   56,067.12x = 77,371.20 × 30,915
4. Step 4: Simplify right side
   56,067.12x = 2,391,930,648
5. Step 5: Solve for x
   x = 2,391,930,648/56,067.12
6. Step 6: Final answer
   x = 42,661.91