Finding the Fourth Proportional to 139,978.74, 193,179.94 and 79,549.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,978.74 : 193,179.94 = 79,549.50 : x
2. Step 2: Convert to fraction form
   139,978.74/193,179.94 = 79,549.50/x
3. Step 3: Cross multiply
   139,978.74x = 193,179.94 × 79,549.50
4. Step 4: Simplify right side
   139,978.74x = 15,367,367,637.03
5. Step 5: Solve for x
   x = 15,367,367,637.03/139,978.74
6. Step 6: Final answer
   x = 109,783.58