Finding the Fourth Proportional to 139,005, 191,829.85 and 78,572.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139,005 : 191,829.85 = 78,572.05 : x
2. Step 2: Convert to fraction form
   139,005/191,829.85 = 78,572.05/x
3. Step 3: Cross multiply
   139,005x = 191,829.85 × 78,572.05
4. Step 4: Simplify right side
   139,005x = 15,072,463,889.69
5. Step 5: Solve for x
   x = 15,072,463,889.69/139,005
6. Step 6: Final answer
   x = 108,431.09