Finding the Fourth Proportional to 76,766.68, 105,945.83 and 42,780.70

Step by Step Solution

1. Step 1: Write the proportion equation
   76,766.68 : 105,945.83 = 42,780.70 : x
2. Step 2: Convert to fraction form
   76,766.68/105,945.83 = 42,780.70/x
3. Step 3: Cross multiply
   76,766.68x = 105,945.83 × 42,780.70
4. Step 4: Simplify right side
   76,766.68x = 4,532,436,769.48
5. Step 5: Solve for x
   x = 4,532,436,769.48/76,766.68
6. Step 6: Final answer
   x = 59,041.72