Finding the Fourth Proportional to 38,105.69, 57,159.90 and 13,146.55

Step by Step Solution

1. Step 1: Write the proportion equation
   38,105.69 : 57,159.90 = 13,146.55 : x
2. Step 2: Convert to fraction form
   38,105.69/57,159.90 = 13,146.55/x
3. Step 3: Cross multiply
   38,105.69x = 57,159.90 × 13,146.55
4. Step 4: Simplify right side
   38,105.69x = 751,455,340.45
5. Step 5: Solve for x
   x = 751,455,340.45/38,105.69
6. Step 6: Final answer
   x = 19,720.29