Finding the Fourth Proportional to 105,182.72, 145,152.96 and 57,435.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,182.72 : 145,152.96 = 57,435.20 : x
2. Step 2: Convert to fraction form
   105,182.72/145,152.96 = 57,435.20/x
3. Step 3: Cross multiply
   105,182.72x = 145,152.96 × 57,435.20
4. Step 4: Simplify right side
   105,182.72x = 8,336,889,288.19
5. Step 5: Solve for x
   x = 8,336,889,288.19/105,182.72
6. Step 6: Final answer
   x = 79,261.02