Finding the Fourth Proportional to 42,769.30, 64,149.84 and 13,179.19

Step by Step Solution

1. Step 1: Write the proportion equation
   42,769.30 : 64,149.84 = 13,179.19 : x
2. Step 2: Convert to fraction form
   42,769.30/64,149.84 = 13,179.19/x
3. Step 3: Cross multiply
   42,769.30x = 64,149.84 × 13,179.19
4. Step 4: Simplify right side
   42,769.30x = 845,442,769.46
5. Step 5: Solve for x
   x = 845,442,769.46/42,769.30
6. Step 6: Final answer
   x = 19,767.52