Finding the Fourth Proportional to 42,821.39, 64,250.55 and 17,866.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42,821.39 : 64,250.55 = 17,866.37 : x
2. Step 2: Convert to fraction form
   42,821.39/64,250.55 = 17,866.37/x
3. Step 3: Cross multiply
   42,821.39x = 64,250.55 × 17,866.37
4. Step 4: Simplify right side
   42,821.39x = 1,147,924,259.63
5. Step 5: Solve for x
   x = 1,147,924,259.63/42,821.39
6. Step 6: Final answer
   x = 26,807.26