Finding the Fourth Proportional to 191,912.72, 287,872.68 and 65,581.88

Step by Step Solution

1. Step 1: Write the proportion equation
   191,912.72 : 287,872.68 = 65,581.88 : x
2. Step 2: Convert to fraction form
   191,912.72/287,872.68 = 65,581.88/x
3. Step 3: Cross multiply
   191,912.72x = 287,872.68 × 65,581.88
4. Step 4: Simplify right side
   191,912.72x = 18,879,231,555.04
5. Step 5: Solve for x
   x = 18,879,231,555.04/191,912.72
6. Step 6: Final answer
   x = 98,374.05