Finding the Fourth Proportional to 139,483.27, 192,495.86 and 78,235.21

Step by Step Solution

1. Step 1: Write the proportion equation
   139,483.27 : 192,495.86 = 78,235.21 : x
2. Step 2: Convert to fraction form
   139,483.27/192,495.86 = 78,235.21/x
3. Step 3: Cross multiply
   139,483.27x = 192,495.86 × 78,235.21
4. Step 4: Simplify right side
   139,483.27x = 15,059,954,031.23
5. Step 5: Solve for x
   x = 15,059,954,031.23/139,483.27
6. Step 6: Final answer
   x = 107,969.61