Finding the Fourth Proportional to 205,916.39, 309,074.31 and 99,375.33

Step by Step Solution

1. Step 1: Write the proportion equation
   205,916.39 : 309,074.31 = 99,375.33 : x
2. Step 2: Convert to fraction form
   205,916.39/309,074.31 = 99,375.33/x
3. Step 3: Cross multiply
   205,916.39x = 309,074.31 × 99,375.33
4. Step 4: Simplify right side
   205,916.39x = 30,714,361,550.77
5. Step 5: Solve for x
   x = 30,714,361,550.77/205,916.39
6. Step 6: Final answer
   x = 149,159.39