Finding the Fourth Proportional to 76,149, 105,071.04 and 49,287.78

Step by Step Solution

1. Step 1: Write the proportion equation
   76,149 : 105,071.04 = 49,287.78 : x
2. Step 2: Convert to fraction form
   76,149/105,071.04 = 49,287.78/x
3. Step 3: Cross multiply
   76,149x = 105,071.04 × 49,287.78
4. Step 4: Simplify right side
   76,149x = 5,178,718,303.89
5. Step 5: Solve for x
   x = 5,178,718,303.89/76,149
6. Step 6: Final answer
   x = 68,007.70