Finding the Fourth Proportional to 105,560.70, 145,674.50 and 57,816.06

Step by Step Solution

1. Step 1: Write the proportion equation
   105,560.70 : 145,674.50 = 57,816.06 : x
2. Step 2: Convert to fraction form
   105,560.70/145,674.50 = 57,816.06/x
3. Step 3: Cross multiply
   105,560.70x = 145,674.50 × 57,816.06
4. Step 4: Simplify right side
   105,560.70x = 8,422,325,343.39
5. Step 5: Solve for x
   x = 8,422,325,343.39/105,560.70
6. Step 6: Final answer
   x = 79,786.56