Finding the Fourth Proportional to 76,722.36, 105,876.55 and 42,731.25

Step by Step Solution

1. Step 1: Write the proportion equation
   76,722.36 : 105,876.55 = 42,731.25 : x
2. Step 2: Convert to fraction form
   76,722.36/105,876.55 = 42,731.25/x
3. Step 3: Cross multiply
   76,722.36x = 105,876.55 × 42,731.25
4. Step 4: Simplify right side
   76,722.36x = 4,524,236,983.56
5. Step 5: Solve for x
   x = 4,524,236,983.56/76,722.36
6. Step 6: Final answer
   x = 58,968.95