Finding the Fourth Proportional to 42,721.67, 64,087.63 and 17,778.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,721.67 : 64,087.63 = 17,778.58 : x
2. Step 2: Convert to fraction form
   42,721.67/64,087.63 = 17,778.58/x
3. Step 3: Cross multiply
   42,721.67x = 64,087.63 × 17,778.58
4. Step 4: Simplify right side
   42,721.67x = 1,139,386,852.30
5. Step 5: Solve for x
   x = 1,139,386,852.30/42,721.67
6. Step 6: Final answer
   x = 26,670.00