Finding the Fourth Proportional to 42,854.89, 64,291.71 and 12,867.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,854.89 : 64,291.71 = 12,867.88 : x
2. Step 2: Convert to fraction form
   42,854.89/64,291.71 = 12,867.88/x
3. Step 3: Cross multiply
   42,854.89x = 64,291.71 × 12,867.88
4. Step 4: Simplify right side
   42,854.89x = 827,298,009.27
5. Step 5: Solve for x
   x = 827,298,009.27/42,854.89
6. Step 6: Final answer
   x = 19,304.63