Finding the Fourth Proportional to 76,760.86, 105,807.30 and 51,216.70

Step by Step Solution

1. Step 1: Write the proportion equation
   76,760.86 : 105,807.30 = 51,216.70 : x
2. Step 2: Convert to fraction form
   76,760.86/105,807.30 = 51,216.70/x
3. Step 3: Cross multiply
   76,760.86x = 105,807.30 × 51,216.70
4. Step 4: Simplify right side
   76,760.86x = 5,419,100,485.83
5. Step 5: Solve for x
   x = 5,419,100,485.83/76,760.86
6. Step 6: Final answer
   x = 70,597.18