Finding the Fourth Proportional to 105,747.80, 145,855.50 and 89,807

Step by Step Solution

1. Step 1: Write the proportion equation
   105,747.80 : 145,855.50 = 89,807 : x
2. Step 2: Convert to fraction form
   105,747.80/145,855.50 = 89,807/x
3. Step 3: Cross multiply
   105,747.80x = 145,855.50 × 89,807
4. Step 4: Simplify right side
   105,747.80x = 13,098,844,888.50
5. Step 5: Solve for x
   x = 13,098,844,888.50/105,747.80
6. Step 6: Final answer
   x = 123,868.72