Finding the Fourth Proportional to 309,910.50, 464,822.10 and 99,521.10

Step by Step Solution

1. Step 1: Write the proportion equation
   309,910.50 : 464,822.10 = 99,521.10 : x
2. Step 2: Convert to fraction form
   309,910.50/464,822.10 = 99,521.10/x
3. Step 3: Cross multiply
   309,910.50x = 464,822.10 × 99,521.10
4. Step 4: Simplify right side
   309,910.50x = 46,259,606,696.31
5. Step 5: Solve for x
   x = 46,259,606,696.31/309,910.50
6. Step 6: Final answer
   x = 149,267.63