Finding the Fourth Proportional to 136,721.88, 188,653.59 and 91,327.05

Step by Step Solution

1. Step 1: Write the proportion equation
   136,721.88 : 188,653.59 = 91,327.05 : x
2. Step 2: Convert to fraction form
   136,721.88/188,653.59 = 91,327.05/x
3. Step 3: Cross multiply
   136,721.88x = 188,653.59 × 91,327.05
4. Step 4: Simplify right side
   136,721.88x = 17,229,175,846.61
5. Step 5: Solve for x
   x = 17,229,175,846.61/136,721.88
6. Step 6: Final answer
   x = 126,016.23