Finding the Fourth Proportional to 105,379.72, 145,423.02 and 57,632.56

Step by Step Solution

1. Step 1: Write the proportion equation
   105,379.72 : 145,423.02 = 57,632.56 : x
2. Step 2: Convert to fraction form
   105,379.72/145,423.02 = 57,632.56/x
3. Step 3: Cross multiply
   105,379.72x = 145,423.02 × 57,632.56
4. Step 4: Simplify right side
   105,379.72x = 8,381,100,925.53
5. Step 5: Solve for x
   x = 8,381,100,925.53/105,379.72
6. Step 6: Final answer
   x = 79,532.39