Finding the Fourth Proportional to 139,978.80, 193,170.84 and 76,316.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,978.80 : 193,170.84 = 76,316.72 : x
2. Step 2: Convert to fraction form
   139,978.80/193,170.84 = 76,316.72/x
3. Step 3: Cross multiply
   139,978.80x = 193,170.84 × 76,316.72
4. Step 4: Simplify right side
   139,978.80x = 14,742,164,908.44
5. Step 5: Solve for x
   x = 14,742,164,908.44/139,978.80
6. Step 6: Final answer
   x = 105,317.13