Finding the Fourth Proportional to 139,042.72, 191,777.02 and 91,278.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,042.72 : 191,777.02 = 91,278.64 : x
2. Step 2: Convert to fraction form
   139,042.72/191,777.02 = 91,278.64/x
3. Step 3: Cross multiply
   139,042.72x = 191,777.02 × 91,278.64
4. Step 4: Simplify right side
   139,042.72x = 17,505,145,568.85
5. Step 5: Solve for x
   x = 17,505,145,568.85/139,042.72
6. Step 6: Final answer
   x = 125,897.61