Finding the Fourth Proportional to 105,362.72, 145,399.20 and 62,977.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105,362.72 : 145,399.20 = 62,977.76 : x
2. Step 2: Convert to fraction form
   105,362.72/145,399.20 = 62,977.76/x
3. Step 3: Cross multiply
   105,362.72x = 145,399.20 × 62,977.76
4. Step 4: Simplify right side
   105,362.72x = 9,156,915,921.79
5. Step 5: Solve for x
   x = 9,156,915,921.79/105,362.72
6. Step 6: Final answer
   x = 86,908.50