Finding the Fourth Proportional to 105,222.42, 145,206.78 and 57,475.78

Step by Step Solution

1. Step 1: Write the proportion equation
   105,222.42 : 145,206.78 = 57,475.78 : x
2. Step 2: Convert to fraction form
   105,222.42/145,206.78 = 57,475.78/x
3. Step 3: Cross multiply
   105,222.42x = 145,206.78 × 57,475.78
4. Step 4: Simplify right side
   105,222.42x = 8,345,872,941.79
5. Step 5: Solve for x
   x = 8,345,872,941.79/105,222.42
6. Step 6: Final answer
   x = 79,316.49