Finding the Fourth Proportional to 42,931.49, 64,408.77 and 17,958.38

Step by Step Solution

1. Step 1: Write the proportion equation
   42,931.49 : 64,408.77 = 17,958.38 : x
2. Step 2: Convert to fraction form
   42,931.49/64,408.77 = 17,958.38/x
3. Step 3: Cross multiply
   42,931.49x = 64,408.77 × 17,958.38
4. Step 4: Simplify right side
   42,931.49x = 1,156,676,844.95
5. Step 5: Solve for x
   x = 1,156,676,844.95/42,931.49
6. Step 6: Final answer
   x = 26,942.39