Finding the Fourth Proportional to 105,164.15, 145,132.43 and 57,421.94

Step by Step Solution

1. Step 1: Write the proportion equation
   105,164.15 : 145,132.43 = 57,421.94 : x
2. Step 2: Convert to fraction form
   105,164.15/145,132.43 = 57,421.94/x
3. Step 3: Cross multiply
   105,164.15x = 145,132.43 × 57,421.94
4. Step 4: Simplify right side
   105,164.15x = 8,333,784,674.74
5. Step 5: Solve for x
   x = 8,333,784,674.74/105,164.15
6. Step 6: Final answer
   x = 79,245.49