Finding the Fourth Proportional to 42,757.82, 64,143.10 and 13,173.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42,757.82 : 64,143.10 = 13,173.18 : x
2. Step 2: Convert to fraction form
   42,757.82/64,143.10 = 13,173.18/x
3. Step 3: Cross multiply
   42,757.82x = 64,143.10 × 13,173.18
4. Step 4: Simplify right side
   42,757.82x = 844,968,602.06
5. Step 5: Solve for x
   x = 844,968,602.06/42,757.82
6. Step 6: Final answer
   x = 19,761.73