Finding the Fourth Proportional to 105,152.24, 145,109.72 and 57,405.04

Step by Step Solution

1. Step 1: Write the proportion equation
   105,152.24 : 145,109.72 = 57,405.04 : x
2. Step 2: Convert to fraction form
   105,152.24/145,109.72 = 57,405.04/x
3. Step 3: Cross multiply
   105,152.24x = 145,109.72 × 57,405.04
4. Step 4: Simplify right side
   105,152.24x = 8,330,029,280.99
5. Step 5: Solve for x
   x = 8,330,029,280.99/105,152.24
6. Step 6: Final answer
   x = 79,218.75