Finding the Fourth Proportional to 139,421.84, 192,359.72 and 78,982.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,421.84 : 192,359.72 = 78,982.88 : x
2. Step 2: Convert to fraction form
   139,421.84/192,359.72 = 78,982.88/x
3. Step 3: Cross multiply
   139,421.84x = 192,359.72 × 78,982.88
4. Step 4: Simplify right side
   139,421.84x = 15,193,124,681.59
5. Step 5: Solve for x
   x = 15,193,124,681.59/139,421.84
6. Step 6: Final answer
   x = 108,972.34