Finding the Fourth Proportional to 42,770.30, 64,151.34 and 13,180.19

Step by Step Solution

1. Step 1: Write the proportion equation
   42,770.30 : 64,151.34 = 13,180.19 : x
2. Step 2: Convert to fraction form
   42,770.30/64,151.34 = 13,180.19/x
3. Step 3: Cross multiply
   42,770.30x = 64,151.34 × 13,180.19
4. Step 4: Simplify right side
   42,770.30x = 845,526,849.95
5. Step 5: Solve for x
   x = 845,526,849.95/42,770.30
6. Step 6: Final answer
   x = 19,769.02