Finding the Fourth Proportional to 77,072.72, 115,618.34 and 27,142.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,072.72 : 115,618.34 = 27,142.50 : x
2. Step 2: Convert to fraction form
   77,072.72/115,618.34 = 27,142.50/x
3. Step 3: Cross multiply
   77,072.72x = 115,618.34 × 27,142.50
4. Step 4: Simplify right side
   77,072.72x = 3,138,170,793.45
5. Step 5: Solve for x
   x = 3,138,170,793.45/77,072.72
6. Step 6: Final answer
   x = 40,717.01