Finding the Fourth Proportional to 42,751.12, 64,123.64 and 13,165.87

Step by Step Solution

1. Step 1: Write the proportion equation
   42,751.12 : 64,123.64 = 13,165.87 : x
2. Step 2: Convert to fraction form
   42,751.12/64,123.64 = 13,165.87/x
3. Step 3: Cross multiply
   42,751.12x = 64,123.64 × 13,165.87
4. Step 4: Simplify right side
   42,751.12x = 844,243,282.03
5. Step 5: Solve for x
   x = 844,243,282.03/42,751.12
6. Step 6: Final answer
   x = 19,747.86