Finding the Fourth Proportional to 105,742.80, 145,848.56 and 89,802

Step by Step Solution

1. Step 1: Write the proportion equation
   105,742.80 : 145,848.56 = 89,802 : x
2. Step 2: Convert to fraction form
   105,742.80/145,848.56 = 89,802/x
3. Step 3: Cross multiply
   105,742.80x = 145,848.56 × 89,802
4. Step 4: Simplify right side
   105,742.80x = 13,097,492,385.12
5. Step 5: Solve for x
   x = 13,097,492,385.12/105,742.80
6. Step 6: Final answer
   x = 123,861.79