Finding the Fourth Proportional to 99,805.79, 149,786.89 and 69,623.71

Step by Step Solution

1. Step 1: Write the proportion equation
   99,805.79 : 149,786.89 = 69,623.71 : x
2. Step 2: Convert to fraction form
   99,805.79/149,786.89 = 69,623.71/x
3. Step 3: Cross multiply
   99,805.79x = 149,786.89 × 69,623.71
4. Step 4: Simplify right side
   99,805.79x = 10,428,718,991.16
5. Step 5: Solve for x
   x = 10,428,718,991.16/99,805.79
6. Step 6: Final answer
   x = 104,490.12