Finding the Fourth Proportional to 42,761.81, 64,139.47 and 15,040.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42,761.81 : 64,139.47 = 15,040.37 : x
2. Step 2: Convert to fraction form
   42,761.81/64,139.47 = 15,040.37/x
3. Step 3: Cross multiply
   42,761.81x = 64,139.47 × 15,040.37
4. Step 4: Simplify right side
   42,761.81x = 964,681,360.40
5. Step 5: Solve for x
   x = 964,681,360.40/42,761.81
6. Step 6: Final answer
   x = 22,559.41