Finding the Fourth Proportional to 105,288.42, 145,297.67 and 57,541.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105,288.42 : 145,297.67 = 57,541.76 : x
2. Step 2: Convert to fraction form
   105,288.42/145,297.67 = 57,541.76/x
3. Step 3: Cross multiply
   105,288.42x = 145,297.67 × 57,541.76
4. Step 4: Simplify right side
   105,288.42x = 8,360,683,671.88
5. Step 5: Solve for x
   x = 8,360,683,671.88/105,288.42
6. Step 6: Final answer
   x = 79,407.44