Finding the Fourth Proportional to 105,591.47, 145,599.43 and 67,290.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,591.47 : 145,599.43 = 67,290.31 : x
2. Step 2: Convert to fraction form
   105,591.47/145,599.43 = 67,290.31/x
3. Step 3: Cross multiply
   105,591.47x = 145,599.43 × 67,290.31
4. Step 4: Simplify right side
   105,591.47x = 9,797,429,716.07
5. Step 5: Solve for x
   x = 9,797,429,716.07/105,591.47
6. Step 6: Final answer
   x = 92,786.19