Finding the Fourth Proportional to 342,667.69, 472,815.79 and 221,792.20

Step by Step Solution

1. Step 1: Write the proportion equation
   342,667.69 : 472,815.79 = 221,792.20 : x
2. Step 2: Convert to fraction form
   342,667.69/472,815.79 = 221,792.20/x
3. Step 3: Cross multiply
   342,667.69x = 472,815.79 × 221,792.20
4. Step 4: Simplify right side
   342,667.69x = 104,866,852,522.32
5. Step 5: Solve for x
   x = 104,866,852,522.32/342,667.69
6. Step 6: Final answer
   x = 306,030.76