Finding the Fourth Proportional to 76,764.07, 105,942.20 and 42,778.09

Step by Step Solution

1. Step 1: Write the proportion equation
   76,764.07 : 105,942.20 = 42,778.09 : x
2. Step 2: Convert to fraction form
   76,764.07/105,942.20 = 42,778.09/x
3. Step 3: Cross multiply
   76,764.07x = 105,942.20 × 42,778.09
4. Step 4: Simplify right side
   76,764.07x = 4,532,004,222.80
5. Step 5: Solve for x
   x = 4,532,004,222.80/76,764.07
6. Step 6: Final answer
   x = 59,038.10