Finding the Fourth Proportional to 76,780.89, 105,917.13 and 52,866.05

Step by Step Solution

1. Step 1: Write the proportion equation
   76,780.89 : 105,917.13 = 52,866.05 : x
2. Step 2: Convert to fraction form
   76,780.89/105,917.13 = 52,866.05/x
3. Step 3: Cross multiply
   76,780.89x = 105,917.13 × 52,866.05
4. Step 4: Simplify right side
   76,780.89x = 5,599,419,760.85
5. Step 5: Solve for x
   x = 5,599,419,760.85/76,780.89
6. Step 6: Final answer
   x = 72,927.26