Finding the Fourth Proportional to 342,895, 473,085.75 and 222,128.86

Step by Step Solution

1. Step 1: Write the proportion equation
   342,895 : 473,085.75 = 222,128.86 : x
2. Step 2: Convert to fraction form
   342,895/473,085.75 = 222,128.86/x
3. Step 3: Cross multiply
   342,895x = 473,085.75 × 222,128.86
4. Step 4: Simplify right side
   342,895x = 105,085,998,329.75
5. Step 5: Solve for x
   x = 105,085,998,329.75/342,895
6. Step 6: Final answer
   x = 306,466.99