Finding the Fourth Proportional to 309,717.72, 464,861.70 and 191,619.72

Step by Step Solution

1. Step 1: Write the proportion equation
   309,717.72 : 464,861.70 = 191,619.72 : x
2. Step 2: Convert to fraction form
   309,717.72/464,861.70 = 191,619.72/x
3. Step 3: Cross multiply
   309,717.72x = 464,861.70 × 191,619.72
4. Step 4: Simplify right side
   309,717.72x = 89,076,668,792.72
5. Step 5: Solve for x
   x = 89,076,668,792.72/309,717.72
6. Step 6: Final answer
   x = 287,605.98