Finding the Fourth Proportional to 105,101.51, 145,002.20 and 80,909.87

Step by Step Solution

1. Step 1: Write the proportion equation
   105,101.51 : 145,002.20 = 80,909.87 : x
2. Step 2: Convert to fraction form
   105,101.51/145,002.20 = 80,909.87/x
3. Step 3: Cross multiply
   105,101.51x = 145,002.20 × 80,909.87
4. Step 4: Simplify right side
   105,101.51x = 11,732,108,022.15
5. Step 5: Solve for x
   x = 11,732,108,022.15/105,101.51
6. Step 6: Final answer
   x = 111,626.45