Finding the Fourth Proportional to 42,761.21, 64,085.31 and 30,954.47

Step by Step Solution

1. Step 1: Write the proportion equation
   42,761.21 : 64,085.31 = 30,954.47 : x
2. Step 2: Convert to fraction form
   42,761.21/64,085.31 = 30,954.47/x
3. Step 3: Cross multiply
   42,761.21x = 64,085.31 × 30,954.47
4. Step 4: Simplify right side
   42,761.21x = 1,983,726,485.41
5. Step 5: Solve for x
   x = 1,983,726,485.41/42,761.21
6. Step 6: Final answer
   x = 46,390.80