Finding the Fourth Proportional to 91,228, 137,571.52 and 89,980.48

Step by Step Solution

1. Step 1: Write the proportion equation
   91,228 : 137,571.52 = 89,980.48 : x
2. Step 2: Convert to fraction form
   91,228/137,571.52 = 89,980.48/x
3. Step 3: Cross multiply
   91,228x = 137,571.52 × 89,980.48
4. Step 4: Simplify right side
   91,228x = 12,378,751,403.93
5. Step 5: Solve for x
   x = 12,378,751,403.93/91,228
6. Step 6: Final answer
   x = 135,690.26