Finding the Fourth Proportional to 56,007.78, 77,290.69 and 30,857.28

Step by Step Solution

1. Step 1: Write the proportion equation
   56,007.78 : 77,290.69 = 30,857.28 : x
2. Step 2: Convert to fraction form
   56,007.78/77,290.69 = 30,857.28/x
3. Step 3: Cross multiply
   56,007.78x = 77,290.69 × 30,857.28
4. Step 4: Simplify right side
   56,007.78x = 2,384,980,462.72
5. Step 5: Solve for x
   x = 2,384,980,462.72/56,007.78
6. Step 6: Final answer
   x = 42,583.02