Finding the Fourth Proportional to 408,513.49, 612,786.72 and 142,300.93

Step by Step Solution

1. Step 1: Write the proportion equation
   408,513.49 : 612,786.72 = 142,300.93 : x
2. Step 2: Convert to fraction form
   408,513.49/612,786.72 = 142,300.93/x
3. Step 3: Cross multiply
   408,513.49x = 612,786.72 × 142,300.93
4. Step 4: Simplify right side
   408,513.49x = 87,200,120,147.65
5. Step 5: Solve for x
   x = 87,200,120,147.65/408,513.49
6. Step 6: Final answer
   x = 213,457.14