Finding the Fourth Proportional to 76,768.55, 105,940.35 and 42,776.79

Step by Step Solution

1. Step 1: Write the proportion equation
   76,768.55 : 105,940.35 = 42,776.79 : x
2. Step 2: Convert to fraction form
   76,768.55/105,940.35 = 42,776.79/x
3. Step 3: Cross multiply
   76,768.55x = 105,940.35 × 42,776.79
4. Step 4: Simplify right side
   76,768.55x = 4,531,788,104.48
5. Step 5: Solve for x
   x = 4,531,788,104.48/76,768.55
6. Step 6: Final answer
   x = 59,031.84