Finding the Fourth Proportional to 42,741.22, 64,118.89 and 13,159.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,741.22 : 64,118.89 = 13,159.16 : x
2. Step 2: Convert to fraction form
   42,741.22/64,118.89 = 13,159.16/x
3. Step 3: Cross multiply
   42,741.22x = 64,118.89 × 13,159.16
4. Step 4: Simplify right side
   42,741.22x = 843,750,668.83
5. Step 5: Solve for x
   x = 843,750,668.83/42,741.22
6. Step 6: Final answer
   x = 19,740.91