Finding the Fourth Proportional to 210,196.80, 315,489.60 and 105,091.20

Step by Step Solution

1. Step 1: Write the proportion equation
   210,196.80 : 315,489.60 = 105,091.20 : x
2. Step 2: Convert to fraction form
   210,196.80/315,489.60 = 105,091.20/x
3. Step 3: Cross multiply
   210,196.80x = 315,489.60 × 105,091.20
4. Step 4: Simplify right side
   210,196.80x = 33,155,180,651.52
5. Step 5: Solve for x
   x = 33,155,180,651.52/210,196.80
6. Step 6: Final answer
   x = 157,733.99