Finding the Fourth Proportional to 57,426.54, 86,315.49 and 47,628.78

Step by Step Solution

1. Step 1: Write the proportion equation
   57,426.54 : 86,315.49 = 47,628.78 : x
2. Step 2: Convert to fraction form
   57,426.54/86,315.49 = 47,628.78/x
3. Step 3: Cross multiply
   57,426.54x = 86,315.49 × 47,628.78
4. Step 4: Simplify right side
   57,426.54x = 4,111,101,483.80
5. Step 5: Solve for x
   x = 4,111,101,483.80/57,426.54
6. Step 6: Final answer
   x = 71,588.88