Finding the Fourth Proportional to 42,877.62, 64,315.89 and 19,178.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,877.62 : 64,315.89 = 19,178.91 : x
2. Step 2: Convert to fraction form
   42,877.62/64,315.89 = 19,178.91/x
3. Step 3: Cross multiply
   42,877.62x = 64,315.89 × 19,178.91
4. Step 4: Simplify right side
   42,877.62x = 1,233,508,665.88
5. Step 5: Solve for x
   x = 1,233,508,665.88/42,877.62
6. Step 6: Final answer
   x = 28,768.12