Finding the Fourth Proportional to 42,770.64, 64,151.83 and 13,180.53

Step by Step Solution

1. Step 1: Write the proportion equation
   42,770.64 : 64,151.83 = 13,180.53 : x
2. Step 2: Convert to fraction form
   42,770.64/64,151.83 = 13,180.53/x
3. Step 3: Cross multiply
   42,770.64x = 64,151.83 × 13,180.53
4. Step 4: Simplify right side
   42,770.64x = 845,555,119.87
5. Step 5: Solve for x
   x = 845,555,119.87/42,770.64
6. Step 6: Final answer
   x = 19,769.52