Finding the Fourth Proportional to 42,642.05, 64,028.68 and 38,005.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,642.05 : 64,028.68 = 38,005.61 : x
2. Step 2: Convert to fraction form
   42,642.05/64,028.68 = 38,005.61/x
3. Step 3: Cross multiply
   42,642.05x = 64,028.68 × 38,005.61
4. Step 4: Simplify right side
   42,642.05x = 2,433,448,625.74
5. Step 5: Solve for x
   x = 2,433,448,625.74/42,642.05
6. Step 6: Final answer
   x = 57,066.88