Finding the Fourth Proportional to 315,309.72, 434,910.78 and 187,887

Step by Step Solution

1. Step 1: Write the proportion equation
   315,309.72 : 434,910.78 = 187,887 : x
2. Step 2: Convert to fraction form
   315,309.72/434,910.78 = 187,887/x
3. Step 3: Cross multiply
   315,309.72x = 434,910.78 × 187,887
4. Step 4: Simplify right side
   315,309.72x = 81,714,081,721.86
5. Step 5: Solve for x
   x = 81,714,081,721.86/315,309.72
6. Step 6: Final answer
   x = 259,154.97