Finding the Fourth Proportional to 309,739.72, 464,894.70 and 191,641.72

Step by Step Solution

1. Step 1: Write the proportion equation
   309,739.72 : 464,894.70 = 191,641.72 : x
2. Step 2: Convert to fraction form
   309,739.72/464,894.70 = 191,641.72/x
3. Step 3: Cross multiply
   309,739.72x = 464,894.70 × 191,641.72
4. Step 4: Simplify right side
   309,739.72x = 89,093,219,926.88
5. Step 5: Solve for x
   x = 89,093,219,926.88/309,739.72
6. Step 6: Final answer
   x = 287,638.99