Finding the Fourth Proportional to 42,748.56, 64,129.73 and 13,166.38

Step by Step Solution

1. Step 1: Write the proportion equation
   42,748.56 : 64,129.73 = 13,166.38 : x
2. Step 2: Convert to fraction form
   42,748.56/64,129.73 = 13,166.38/x
3. Step 3: Cross multiply
   42,748.56x = 64,129.73 × 13,166.38
4. Step 4: Simplify right side
   42,748.56x = 844,356,554.80
5. Step 5: Solve for x
   x = 844,356,554.80/42,748.56
6. Step 6: Final answer
   x = 19,751.70