Finding the Fourth Proportional to 105,272.49, 145,429.71 and 91,100.73

Step by Step Solution

1. Step 1: Write the proportion equation
   105,272.49 : 145,429.71 = 91,100.73 : x
2. Step 2: Convert to fraction form
   105,272.49/145,429.71 = 91,100.73/x
3. Step 3: Cross multiply
   105,272.49x = 145,429.71 × 91,100.73
4. Step 4: Simplify right side
   105,272.49x = 13,248,752,744.69
5. Step 5: Solve for x
   x = 13,248,752,744.69/105,272.49
6. Step 6: Final answer
   x = 125,851.99