Finding the Fourth Proportional to 105,167.36, 145,129.32 and 57,419.69

Step by Step Solution

1. Step 1: Write the proportion equation
   105,167.36 : 145,129.32 = 57,419.69 : x
2. Step 2: Convert to fraction form
   105,167.36/145,129.32 = 57,419.69/x
3. Step 3: Cross multiply
   105,167.36x = 145,129.32 × 57,419.69
4. Step 4: Simplify right side
   105,167.36x = 8,333,279,838.66
5. Step 5: Solve for x
   x = 8,333,279,838.66/105,167.36
6. Step 6: Final answer
   x = 79,238.27