Finding the Fourth Proportional to 56,007.81, 77,290.74 and 30,857.31

Step by Step Solution

1. Step 1: Write the proportion equation
   56,007.81 : 77,290.74 = 30,857.31 : x
2. Step 2: Convert to fraction form
   56,007.81/77,290.74 = 30,857.31/x
3. Step 3: Cross multiply
   56,007.81x = 77,290.74 × 30,857.31
4. Step 4: Simplify right side
   56,007.81x = 2,384,984,324.31
5. Step 5: Solve for x
   x = 2,384,984,324.31/56,007.81
6. Step 6: Final answer
   x = 42,583.07