Finding the Fourth Proportional to 105,660.76, 145,826.80 and 65,387.49

Step by Step Solution

1. Step 1: Write the proportion equation
   105,660.76 : 145,826.80 = 65,387.49 : x
2. Step 2: Convert to fraction form
   105,660.76/145,826.80 = 65,387.49/x
3. Step 3: Cross multiply
   105,660.76x = 145,826.80 × 65,387.49
4. Step 4: Simplify right side
   105,660.76x = 9,535,248,627.83
5. Step 5: Solve for x
   x = 9,535,248,627.83/105,660.76
6. Step 6: Final answer
   x = 90,243.99