Finding the Fourth Proportional to 105,732.24, 145,907.16 and 57,984.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,732.24 : 145,907.16 = 57,984.72 : x
2. Step 2: Convert to fraction form
   105,732.24/145,907.16 = 57,984.72/x
3. Step 3: Cross multiply
   105,732.24x = 145,907.16 × 57,984.72
4. Step 4: Simplify right side
   105,732.24x = 8,460,385,818.60
5. Step 5: Solve for x
   x = 8,460,385,818.60/105,732.24
6. Step 6: Final answer
   x = 80,017.09