Finding the Fourth Proportional to 99,081.50, 136,628.25 and 76,424.18

Step by Step Solution

1. Step 1: Write the proportion equation
   99,081.50 : 136,628.25 = 76,424.18 : x
2. Step 2: Convert to fraction form
   99,081.50/136,628.25 = 76,424.18/x
3. Step 3: Cross multiply
   99,081.50x = 136,628.25 × 76,424.18
4. Step 4: Simplify right side
   99,081.50x = 10,441,701,971.09
5. Step 5: Solve for x
   x = 10,441,701,971.09/99,081.50
6. Step 6: Final answer
   x = 105,384.98