Finding the Fourth Proportional to 42,769.98, 64,150.85 and 13,179.87

Step by Step Solution

1. Step 1: Write the proportion equation
   42,769.98 : 64,150.85 = 13,179.87 : x
2. Step 2: Convert to fraction form
   42,769.98/64,150.85 = 13,179.87/x
3. Step 3: Cross multiply
   42,769.98x = 64,150.85 × 13,179.87
4. Step 4: Simplify right side
   42,769.98x = 845,499,797.49
5. Step 5: Solve for x
   x = 845,499,797.49/42,769.98
6. Step 6: Final answer
   x = 19,768.53