Finding the Fourth Proportional to 105,168.84, 145,131.90 and 57,422.04

Step by Step Solution

1. Step 1: Write the proportion equation
   105,168.84 : 145,131.90 = 57,422.04 : x
2. Step 2: Convert to fraction form
   105,168.84/145,131.90 = 57,422.04/x
3. Step 3: Cross multiply
   105,168.84x = 145,131.90 × 57,422.04
4. Step 4: Simplify right side
   105,168.84x = 8,333,769,767.08
5. Step 5: Solve for x
   x = 8,333,769,767.08/105,168.84
6. Step 6: Final answer
   x = 79,241.82