Finding the Fourth Proportional to 105,897.54, 146,064.85 and 89,871.62

Step by Step Solution

1. Step 1: Write the proportion equation
   105,897.54 : 146,064.85 = 89,871.62 : x
2. Step 2: Convert to fraction form
   105,897.54/146,064.85 = 89,871.62/x
3. Step 3: Cross multiply
   105,897.54x = 146,064.85 × 89,871.62
4. Step 4: Simplify right side
   105,897.54x = 13,127,084,694.56
5. Step 5: Solve for x
   x = 13,127,084,694.56/105,897.54
6. Step 6: Final answer
   x = 123,960.24