Finding the Fourth Proportional to 78,681.21, 108,578.70 and 42,871.47

Step by Step Solution

1. Step 1: Write the proportion equation
   78,681.21 : 108,578.70 = 42,871.47 : x
2. Step 2: Convert to fraction form
   78,681.21/108,578.70 = 42,871.47/x
3. Step 3: Cross multiply
   78,681.21x = 108,578.70 × 42,871.47
4. Step 4: Simplify right side
   78,681.21x = 4,654,928,479.69
5. Step 5: Solve for x
   x = 4,654,928,479.69/78,681.21
6. Step 6: Final answer
   x = 59,161.88