Finding the Fourth Proportional to 105,164.93, 145,131.04 and 57,421.91

Step by Step Solution

1. Step 1: Write the proportion equation
   105,164.93 : 145,131.04 = 57,421.91 : x
2. Step 2: Convert to fraction form
   105,164.93/145,131.04 = 57,421.91/x
3. Step 3: Cross multiply
   105,164.93x = 145,131.04 × 57,421.91
4. Step 4: Simplify right side
   105,164.93x = 8,333,701,951.69
5. Step 5: Solve for x
   x = 8,333,701,951.69/105,164.93
6. Step 6: Final answer
   x = 79,244.11