Finding the Fourth Proportional to 42,831.32, 64,212.35 and 17,890.47

Step by Step Solution

1. Step 1: Write the proportion equation
   42,831.32 : 64,212.35 = 17,890.47 : x
2. Step 2: Convert to fraction form
   42,831.32/64,212.35 = 17,890.47/x
3. Step 3: Cross multiply
   42,831.32x = 64,212.35 × 17,890.47
4. Step 4: Simplify right side
   42,831.32x = 1,148,789,031.85
5. Step 5: Solve for x
   x = 1,148,789,031.85/42,831.32
6. Step 6: Final answer
   x = 26,821.24