Finding the Fourth Proportional to 105,304.12, 145,315.32 and 57,559.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,304.12 : 145,315.32 = 57,559.12 : x
2. Step 2: Convert to fraction form
   105,304.12/145,315.32 = 57,559.12/x
3. Step 3: Cross multiply
   105,304.12x = 145,315.32 × 57,559.12
4. Step 4: Simplify right side
   105,304.12x = 8,364,221,941.72
5. Step 5: Solve for x
   x = 8,364,221,941.72/105,304.12
6. Step 6: Final answer
   x = 79,429.20