Finding the Fourth Proportional to 42,896.28, 64,255.86 and 31,815.48

Step by Step Solution

1. Step 1: Write the proportion equation
   42,896.28 : 64,255.86 = 31,815.48 : x
2. Step 2: Convert to fraction form
   42,896.28/64,255.86 = 31,815.48/x
3. Step 3: Cross multiply
   42,896.28x = 64,255.86 × 31,815.48
4. Step 4: Simplify right side
   42,896.28x = 2,044,331,028.71
5. Step 5: Solve for x
   x = 2,044,331,028.71/42,896.28
6. Step 6: Final answer
   x = 47,657.54