Finding the Fourth Proportional to 42,770.48, 64,151.59 and 13,180.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42,770.48 : 64,151.59 = 13,180.37 : x
2. Step 2: Convert to fraction form
   42,770.48/64,151.59 = 13,180.37/x
3. Step 3: Cross multiply
   42,770.48x = 64,151.59 × 13,180.37
4. Step 4: Simplify right side
   42,770.48x = 845,541,692.29
5. Step 5: Solve for x
   x = 845,541,692.29/42,770.48
6. Step 6: Final answer
   x = 19,769.28