Finding the Fourth Proportional to 42,769.48, 64,150.10 and 13,179.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42,769.48 : 64,150.10 = 13,179.37 : x
2. Step 2: Convert to fraction form
   42,769.48/64,150.10 = 13,179.37/x
3. Step 3: Cross multiply
   42,769.48x = 64,150.10 × 13,179.37
4. Step 4: Simplify right side
   42,769.48x = 845,457,837.54
5. Step 5: Solve for x
   x = 845,457,837.54/42,769.48
6. Step 6: Final answer
   x = 19,767.78