Finding the Fourth Proportional to 139,906.72, 193,065.64 and 76,243.15

Step by Step Solution

1. Step 1: Write the proportion equation
   139,906.72 : 193,065.64 = 76,243.15 : x
2. Step 2: Convert to fraction form
   139,906.72/193,065.64 = 76,243.15/x
3. Step 3: Cross multiply
   139,906.72x = 193,065.64 × 76,243.15
4. Step 4: Simplify right side
   139,906.72x = 14,719,931,877.09
5. Step 5: Solve for x
   x = 14,719,931,877.09/139,906.72
6. Step 6: Final answer
   x = 105,212.47