Finding the Fourth Proportional to 105,746.80, 145,854.12 and 89,806

Step by Step Solution

1. Step 1: Write the proportion equation
   105,746.80 : 145,854.12 = 89,806 : x
2. Step 2: Convert to fraction form
   105,746.80/145,854.12 = 89,806/x
3. Step 3: Cross multiply
   105,746.80x = 145,854.12 × 89,806
4. Step 4: Simplify right side
   105,746.80x = 13,098,575,100.72
5. Step 5: Solve for x
   x = 13,098,575,100.72/105,746.80
6. Step 6: Final answer
   x = 123,867.34