Finding the Fourth Proportional to 105,039.90, 144,955.71 and 57,294.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,039.90 : 144,955.71 = 57,294.18 : x
2. Step 2: Convert to fraction form
   105,039.90/144,955.71 = 57,294.18/x
3. Step 3: Cross multiply
   105,039.90x = 144,955.71 × 57,294.18
4. Step 4: Simplify right side
   105,039.90x = 8,305,118,540.77
5. Step 5: Solve for x
   x = 8,305,118,540.77/105,039.90
6. Step 6: Final answer
   x = 79,066.32