Finding the Fourth Proportional to 91,587.11, 138,086.98 and 91,018.49

Step by Step Solution

1. Step 1: Write the proportion equation
   91,587.11 : 138,086.98 = 91,018.49 : x
2. Step 2: Convert to fraction form
   91,587.11/138,086.98 = 91,018.49/x
3. Step 3: Cross multiply
   91,587.11x = 138,086.98 × 91,018.49
4. Step 4: Simplify right side
   91,587.11x = 12,568,467,490.28
5. Step 5: Solve for x
   x = 12,568,467,490.28/91,587.11
6. Step 6: Final answer
   x = 137,229.66