Finding the Fourth Proportional to 139,043.72, 191,778.41 and 91,279.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,043.72 : 191,778.41 = 91,279.64 : x
2. Step 2: Convert to fraction form
   139,043.72/191,778.41 = 91,279.64/x
3. Step 3: Cross multiply
   139,043.72x = 191,778.41 × 91,279.64
4. Step 4: Simplify right side
   139,043.72x = 17,505,463,493.88
5. Step 5: Solve for x
   x = 17,505,463,493.88/139,043.72
6. Step 6: Final answer
   x = 125,898.99