Finding the Fourth Proportional to 76,755.81, 105,915.83 and 56,623.86

Step by Step Solution

1. Step 1: Write the proportion equation
   76,755.81 : 105,915.83 = 56,623.86 : x
2. Step 2: Convert to fraction form
   76,755.81/105,915.83 = 56,623.86/x
3. Step 3: Cross multiply
   76,755.81x = 105,915.83 × 56,623.86
4. Step 4: Simplify right side
   76,755.81x = 5,997,362,846.58
5. Step 5: Solve for x
   x = 5,997,362,846.58/76,755.81
6. Step 6: Final answer
   x = 78,135.62