Finding the Fourth Proportional to 231,468.65, 347,230.71 and 81,678

Step by Step Solution

1. Step 1: Write the proportion equation
   231,468.65 : 347,230.71 = 81,678 : x
2. Step 2: Convert to fraction form
   231,468.65/347,230.71 = 81,678/x
3. Step 3: Cross multiply
   231,468.65x = 347,230.71 × 81,678
4. Step 4: Simplify right side
   231,468.65x = 28,361,109,931.38
5. Step 5: Solve for x
   x = 28,361,109,931.38/231,468.65
6. Step 6: Final answer
   x = 122,526.79