Finding the Fourth Proportional to 72,990.81, 100,727.39 and 42,770.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72,990.81 : 100,727.39 = 42,770.12 : x
2. Step 2: Convert to fraction form
   72,990.81/100,727.39 = 42,770.12/x
3. Step 3: Cross multiply
   72,990.81x = 100,727.39 × 42,770.12
4. Step 4: Simplify right side
   72,990.81x = 4,308,122,557.59
5. Step 5: Solve for x
   x = 4,308,122,557.59/72,990.81
6. Step 6: Final answer
   x = 59,022.81