Finding the Fourth Proportional to 76,800.97, 105,991.50 and 42,820.47

Step by Step Solution

1. Step 1: Write the proportion equation
   76,800.97 : 105,991.50 = 42,820.47 : x
2. Step 2: Convert to fraction form
   76,800.97/105,991.50 = 42,820.47/x
3. Step 3: Cross multiply
   76,800.97x = 105,991.50 × 42,820.47
4. Step 4: Simplify right side
   76,800.97x = 4,538,605,846.01
5. Step 5: Solve for x
   x = 4,538,605,846.01/76,800.97
6. Step 6: Final answer
   x = 59,095.68