Finding the Fourth Proportional to 320,417.91, 442,368.59 and 199,722.69

Step by Step Solution

1. Step 1: Write the proportion equation
   320,417.91 : 442,368.59 = 199,722.69 : x
2. Step 2: Convert to fraction form
   320,417.91/442,368.59 = 199,722.69/x
3. Step 3: Cross multiply
   320,417.91x = 442,368.59 × 199,722.69
4. Step 4: Simplify right side
   320,417.91x = 88,351,043,767.69
5. Step 5: Solve for x
   x = 88,351,043,767.69/320,417.91
6. Step 6: Final answer
   x = 275,736.91