Finding the Fourth Proportional to 42,960.78, 64,415.28 and 19,264.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,960.78 : 64,415.28 = 19,264.04 : x
2. Step 2: Convert to fraction form
   42,960.78/64,415.28 = 19,264.04/x
3. Step 3: Cross multiply
   42,960.78x = 64,415.28 × 19,264.04
4. Step 4: Simplify right side
   42,960.78x = 1,240,898,208.45
5. Step 5: Solve for x
   x = 1,240,898,208.45/42,960.78
6. Step 6: Final answer
   x = 28,884.44