Finding the Fourth Proportional to 42,761.97, 64,086.42 and 30,955.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,761.97 : 64,086.42 = 30,955.20 : x
2. Step 2: Convert to fraction form
   42,761.97/64,086.42 = 30,955.20/x
3. Step 3: Cross multiply
   42,761.97x = 64,086.42 × 30,955.20
4. Step 4: Simplify right side
   42,761.97x = 1,983,807,948.38
5. Step 5: Solve for x
   x = 1,983,807,948.38/42,761.97
6. Step 6: Final answer
   x = 46,391.87