Finding the Fourth Proportional to 42,109.36, 63,120.12 and 17,139.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,109.36 : 63,120.12 = 17,139.40 : x
2. Step 2: Convert to fraction form
   42,109.36/63,120.12 = 17,139.40/x
3. Step 3: Cross multiply
   42,109.36x = 63,120.12 × 17,139.40
4. Step 4: Simplify right side
   42,109.36x = 1,081,840,984.73
5. Step 5: Solve for x
   x = 1,081,840,984.73/42,109.36
6. Step 6: Final answer
   x = 25,691.22