Finding the Fourth Proportional to 42,857.61, 64,296.60 and 17,883.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,857.61 : 64,296.60 = 17,883.78 : x
2. Step 2: Convert to fraction form
   42,857.61/64,296.60 = 17,883.78/x
3. Step 3: Cross multiply
   42,857.61x = 64,296.60 × 17,883.78
4. Step 4: Simplify right side
   42,857.61x = 1,149,866,249.15
5. Step 5: Solve for x
   x = 1,149,866,249.15/42,857.61
6. Step 6: Final answer
   x = 26,829.92