Finding the Fourth Proportional to 105,485.76, 145,504.80 and 65,211.84

Step by Step Solution

1. Step 1: Write the proportion equation
   105,485.76 : 145,504.80 = 65,211.84 : x
2. Step 2: Convert to fraction form
   105,485.76/145,504.80 = 65,211.84/x
3. Step 3: Cross multiply
   105,485.76x = 145,504.80 × 65,211.84
4. Step 4: Simplify right side
   105,485.76x = 9,488,635,736.83
5. Step 5: Solve for x
   x = 9,488,635,736.83/105,485.76
6. Step 6: Final answer
   x = 89,951.82