Finding the Fourth Proportional to 76,778.89, 105,914.38 and 52,864.05

Step by Step Solution

1. Step 1: Write the proportion equation
   76,778.89 : 105,914.38 = 52,864.05 : x
2. Step 2: Convert to fraction form
   76,778.89/105,914.38 = 52,864.05/x
3. Step 3: Cross multiply
   76,778.89x = 105,914.38 × 52,864.05
4. Step 4: Simplify right side
   76,778.89x = 5,599,063,080.04
5. Step 5: Solve for x
   x = 5,599,063,080.04/76,778.89
6. Step 6: Final answer
   x = 72,924.51