Finding the Fourth Proportional to 42,755.20, 64,139.82 and 13,173.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,755.20 : 64,139.82 = 13,173.04 : x
2. Step 2: Convert to fraction form
   42,755.20/64,139.82 = 13,173.04/x
3. Step 3: Cross multiply
   42,755.20x = 64,139.82 × 13,173.04
4. Step 4: Simplify right side
   42,755.20x = 844,916,414.45
5. Step 5: Solve for x
   x = 844,916,414.45/42,755.20
6. Step 6: Final answer
   x = 19,761.72