Finding the Fourth Proportional to 76,150, 105,072.42 and 49,288.78

Step by Step Solution

1. Step 1: Write the proportion equation
   76,150 : 105,072.42 = 49,288.78 : x
2. Step 2: Convert to fraction form
   76,150/105,072.42 = 49,288.78/x
3. Step 3: Cross multiply
   76,150x = 105,072.42 × 49,288.78
4. Step 4: Simplify right side
   76,150x = 5,178,891,393.45
5. Step 5: Solve for x
   x = 5,178,891,393.45/76,150
6. Step 6: Final answer
   x = 68,009.08