Finding the Fourth Proportional to 42,852.24, 64,287.74 and 12,865.23

Step by Step Solution

1. Step 1: Write the proportion equation
   42,852.24 : 64,287.74 = 12,865.23 : x
2. Step 2: Convert to fraction form
   42,852.24/64,287.74 = 12,865.23/x
3. Step 3: Cross multiply
   42,852.24x = 64,287.74 × 12,865.23
4. Step 4: Simplify right side
   42,852.24x = 827,076,561.28
5. Step 5: Solve for x
   x = 827,076,561.28/42,852.24
6. Step 6: Final answer
   x = 19,300.66