Finding the Fourth Proportional to 76,803.72, 105,995.31 and 42,823.20

Step by Step Solution

1. Step 1: Write the proportion equation
   76,803.72 : 105,995.31 = 42,823.20 : x
2. Step 2: Convert to fraction form
   76,803.72/105,995.31 = 42,823.20/x
3. Step 3: Cross multiply
   76,803.72x = 105,995.31 × 42,823.20
4. Step 4: Simplify right side
   76,803.72x = 4,539,058,359.19
5. Step 5: Solve for x
   x = 4,539,058,359.19/76,803.72
6. Step 6: Final answer
   x = 59,099.46