Finding the Fourth Proportional to 76,810.69, 105,998.50 and 42,818.80

Step by Step Solution

1. Step 1: Write the proportion equation
   76,810.69 : 105,998.50 = 42,818.80 : x
2. Step 2: Convert to fraction form
   76,810.69/105,998.50 = 42,818.80/x
3. Step 3: Cross multiply
   76,810.69x = 105,998.50 × 42,818.80
4. Step 4: Simplify right side
   76,810.69x = 4,538,728,571.80
5. Step 5: Solve for x
   x = 4,538,728,571.80/76,810.69
6. Step 6: Final answer
   x = 59,089.80