Finding the Fourth Proportional to 99,805.09, 137,754.18 and 65,819.71

Step by Step Solution

1. Step 1: Write the proportion equation
   99,805.09 : 137,754.18 = 65,819.71 : x
2. Step 2: Convert to fraction form
   99,805.09/137,754.18 = 65,819.71/x
3. Step 3: Cross multiply
   99,805.09x = 137,754.18 × 65,819.71
4. Step 4: Simplify right side
   99,805.09x = 9,066,940,178.89
5. Step 5: Solve for x
   x = 9,066,940,178.89/99,805.09
6. Step 6: Final answer
   x = 90,846.47