Finding the Fourth Proportional to 404,886.74, 607,698.72 and 215,506.17

Step by Step Solution

1. Step 1: Write the proportion equation
   404,886.74 : 607,698.72 = 215,506.17 : x
2. Step 2: Convert to fraction form
   404,886.74/607,698.72 = 215,506.17/x
3. Step 3: Cross multiply
   404,886.74x = 607,698.72 × 215,506.17
4. Step 4: Simplify right side
   404,886.74x = 130,962,823,661.10
5. Step 5: Solve for x
   x = 130,962,823,661.10/404,886.74
6. Step 6: Final answer
   x = 323,455.46