Finding the Fourth Proportional to 42,744.18, 64,123.56 and 13,156.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,744.18 : 64,123.56 = 13,156.50 : x
2. Step 2: Convert to fraction form
   42,744.18/64,123.56 = 13,156.50/x
3. Step 3: Cross multiply
   42,744.18x = 64,123.56 × 13,156.50
4. Step 4: Simplify right side
   42,744.18x = 843,641,617.14
5. Step 5: Solve for x
   x = 843,641,617.14/42,744.18
6. Step 6: Final answer
   x = 19,736.99