Finding the Fourth Proportional to 42,777.82, 64,172.76 and 13,198.06

Step by Step Solution

1. Step 1: Write the proportion equation
   42,777.82 : 64,172.76 = 13,198.06 : x
2. Step 2: Convert to fraction form
   42,777.82/64,172.76 = 13,198.06/x
3. Step 3: Cross multiply
   42,777.82x = 64,172.76 × 13,198.06
4. Step 4: Simplify right side
   42,777.82x = 846,955,936.85
5. Step 5: Solve for x
   x = 846,955,936.85/42,777.82
6. Step 6: Final answer
   x = 19,798.95