Finding the Fourth Proportional to 105,112.49, 145,058.31 and 57,368.93

Step by Step Solution

1. Step 1: Write the proportion equation
   105,112.49 : 145,058.31 = 57,368.93 : x
2. Step 2: Convert to fraction form
   105,112.49/145,058.31 = 57,368.93/x
3. Step 3: Cross multiply
   105,112.49x = 145,058.31 × 57,368.93
4. Step 4: Simplify right side
   105,112.49x = 8,321,839,307.02
5. Step 5: Solve for x
   x = 8,321,839,307.02/105,112.49
6. Step 6: Final answer
   x = 79,170.80