Finding the Fourth Proportional to 42,678.63, 64,046.52 and 17,718.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42,678.63 : 64,046.52 = 17,718.71 : x
2. Step 2: Convert to fraction form
   42,678.63/64,046.52 = 17,718.71/x
3. Step 3: Cross multiply
   42,678.63x = 64,046.52 × 17,718.71
4. Step 4: Simplify right side
   42,678.63x = 1,134,821,394.16
5. Step 5: Solve for x
   x = 1,134,821,394.16/42,678.63
6. Step 6: Final answer
   x = 26,589.92