Finding the Fourth Proportional to 76,769.46, 105,940.78 and 42,779.39

Step by Step Solution

1. Step 1: Write the proportion equation
   76,769.46 : 105,940.78 = 42,779.39 : x
2. Step 2: Convert to fraction form
   76,769.46/105,940.78 = 42,779.39/x
3. Step 3: Cross multiply
   76,769.46x = 105,940.78 × 42,779.39
4. Step 4: Simplify right side
   76,769.46x = 4,532,081,307.87
5. Step 5: Solve for x
   x = 4,532,081,307.87/76,769.46
6. Step 6: Final answer
   x = 59,034.95