Finding the Fourth Proportional to 105,527.80, 158,061.30 and 81,969.40

Step by Step Solution

1. Step 1: Write the proportion equation
   105,527.80 : 158,061.30 = 81,969.40 : x
2. Step 2: Convert to fraction form
   105,527.80/158,061.30 = 81,969.40/x
3. Step 3: Cross multiply
   105,527.80x = 158,061.30 × 81,969.40
4. Step 4: Simplify right side
   105,527.80x = 12,956,189,924.22
5. Step 5: Solve for x
   x = 12,956,189,924.22/105,527.80
6. Step 6: Final answer
   x = 122,775.14