Finding the Fourth Proportional to 76,809.69, 105,997.13 and 42,817.80

Step by Step Solution

1. Step 1: Write the proportion equation
   76,809.69 : 105,997.13 = 42,817.80 : x
2. Step 2: Convert to fraction form
   76,809.69/105,997.13 = 42,817.80/x
3. Step 3: Cross multiply
   76,809.69x = 105,997.13 × 42,817.80
4. Step 4: Simplify right side
   76,809.69x = 4,538,563,698.83
5. Step 5: Solve for x
   x = 4,538,563,698.83/76,809.69
6. Step 6: Final answer
   x = 59,088.43