Finding the Fourth Proportional to 105,270.56, 145,289.60 and 64,458.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,270.56 : 145,289.60 = 64,458.72 : x
2. Step 2: Convert to fraction form
   105,270.56/145,289.60 = 64,458.72/x
3. Step 3: Cross multiply
   105,270.56x = 145,289.60 × 64,458.72
4. Step 4: Simplify right side
   105,270.56x = 9,365,181,645.31
5. Step 5: Solve for x
   x = 9,365,181,645.31/105,270.56
6. Step 6: Final answer
   x = 88,962.97