Finding the Fourth Proportional to 139,085.24, 191,929.55 and 78,668.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139,085.24 : 191,929.55 = 78,668.55 : x
2. Step 2: Convert to fraction form
   139,085.24/191,929.55 = 78,668.55/x
3. Step 3: Cross multiply
   139,085.24x = 191,929.55 × 78,668.55
4. Step 4: Simplify right side
   139,085.24x = 15,098,819,007.31
5. Step 5: Solve for x
   x = 15,098,819,007.31/139,085.24
6. Step 6: Final answer
   x = 108,558.03