Finding the Fourth Proportional to 105,063.18, 144,945.92 and 64,706.91

Step by Step Solution

1. Step 1: Write the proportion equation
   105,063.18 : 144,945.92 = 64,706.91 : x
2. Step 2: Convert to fraction form
   105,063.18/144,945.92 = 64,706.91/x
3. Step 3: Cross multiply
   105,063.18x = 144,945.92 × 64,706.91
4. Step 4: Simplify right side
   105,063.18x = 9,379,001,875.58
5. Step 5: Solve for x
   x = 9,379,001,875.58/105,063.18
6. Step 6: Final answer
   x = 89,270.11