Finding the Fourth Proportional to 205,308.18, 308,100.78 and 72,189.18

Step by Step Solution

1. Step 1: Write the proportion equation
   205,308.18 : 308,100.78 = 72,189.18 : x
2. Step 2: Convert to fraction form
   205,308.18/308,100.78 = 72,189.18/x
3. Step 3: Cross multiply
   205,308.18x = 308,100.78 × 72,189.18
4. Step 4: Simplify right side
   205,308.18x = 22,241,542,665.56
5. Step 5: Solve for x
   x = 22,241,542,665.56/205,308.18
6. Step 6: Final answer
   x = 108,332.47