Finding the Fourth Proportional to 404,915.99, 607,742.33 and 215,535.56

Step by Step Solution

1. Step 1: Write the proportion equation
   404,915.99 : 607,742.33 = 215,535.56 : x
2. Step 2: Convert to fraction form
   404,915.99/607,742.33 = 215,535.56/x
3. Step 3: Cross multiply
   404,915.99x = 607,742.33 × 215,535.56
4. Step 4: Simplify right side
   404,915.99x = 130,990,079,315.87
5. Step 5: Solve for x
   x = 130,990,079,315.87/404,915.99
6. Step 6: Final answer
   x = 323,499.40