Finding the Fourth Proportional to 315,828.72, 435,639.96 and 188,406

Step by Step Solution

1. Step 1: Write the proportion equation
   315,828.72 : 435,639.96 = 188,406 : x
2. Step 2: Convert to fraction form
   315,828.72/435,639.96 = 188,406/x
3. Step 3: Cross multiply
   315,828.72x = 435,639.96 × 188,406
4. Step 4: Simplify right side
   315,828.72x = 82,077,182,303.76
5. Step 5: Solve for x
   x = 82,077,182,303.76/315,828.72
6. Step 6: Final answer
   x = 259,878.78