Finding the Fourth Proportional to 105,700.49, 145,865.57 and 57,953.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,700.49 : 145,865.57 = 57,953.72 : x
2. Step 2: Convert to fraction form
   105,700.49/145,865.57 = 57,953.72/x
3. Step 3: Cross multiply
   105,700.49x = 145,865.57 × 57,953.72
4. Step 4: Simplify right side
   105,700.49x = 8,453,452,111.65
5. Step 5: Solve for x
   x = 8,453,452,111.65/105,700.49
6. Step 6: Final answer
   x = 79,975.52