Finding the Fourth Proportional to 145,783.30, 218,610.15 and 57,007.30

Step by Step Solution

1. Step 1: Write the proportion equation
   145,783.30 : 218,610.15 = 57,007.30 : x
2. Step 2: Convert to fraction form
   145,783.30/218,610.15 = 57,007.30/x
3. Step 3: Cross multiply
   145,783.30x = 218,610.15 × 57,007.30
4. Step 4: Simplify right side
   145,783.30x = 12,462,374,404.10
5. Step 5: Solve for x
   x = 12,462,374,404.10/145,783.30
6. Step 6: Final answer
   x = 85,485.61