Finding the Fourth Proportional to 105,069.47, 145,007.05 and 64,257.47

Step by Step Solution

1. Step 1: Write the proportion equation
   105,069.47 : 145,007.05 = 64,257.47 : x
2. Step 2: Convert to fraction form
   105,069.47/145,007.05 = 64,257.47/x
3. Step 3: Cross multiply
   105,069.47x = 145,007.05 × 64,257.47
4. Step 4: Simplify right side
   105,069.47x = 9,317,786,367.04
5. Step 5: Solve for x
   x = 9,317,786,367.04/105,069.47
6. Step 6: Final answer
   x = 88,682.15