Finding the Fourth Proportional to 42,117.53, 63,121.64 and 17,128.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42,117.53 : 63,121.64 = 17,128.49 : x
2. Step 2: Convert to fraction form
   42,117.53/63,121.64 = 17,128.49/x
3. Step 3: Cross multiply
   42,117.53x = 63,121.64 × 17,128.49
4. Step 4: Simplify right side
   42,117.53x = 1,081,177,978.27
5. Step 5: Solve for x
   x = 1,081,177,978.27/42,117.53
6. Step 6: Final answer
   x = 25,670.50