Finding the Fourth Proportional to 42,960.43, 64,408.23 and 28,173.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,960.43 : 64,408.23 = 28,173.07 : x
2. Step 2: Convert to fraction form
   42,960.43/64,408.23 = 28,173.07/x
3. Step 3: Cross multiply
   42,960.43x = 64,408.23 × 28,173.07
4. Step 4: Simplify right side
   42,960.43x = 1,814,577,572.37
5. Step 5: Solve for x
   x = 1,814,577,572.37/42,960.43
6. Step 6: Final answer
   x = 42,238.35