Finding the Fourth Proportional to 42,128.78, 63,175.64 and 17,151.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128.78 : 63,175.64 = 17,151.88 : x
2. Step 2: Convert to fraction form
   42,128.78/63,175.64 = 17,151.88/x
3. Step 3: Cross multiply
   42,128.78x = 63,175.64 × 17,151.88
4. Step 4: Simplify right side
   42,128.78x = 1,083,580,996.20
5. Step 5: Solve for x
   x = 1,083,580,996.20/42,128.78
6. Step 6: Final answer
   x = 25,720.68