Finding the Fourth Proportional to 35,790.72, 53,640.72 and 20,217.12

Step by Step Solution

1. Step 1: Write the proportion equation
   35,790.72 : 53,640.72 = 20,217.12 : x
2. Step 2: Convert to fraction form
   35,790.72/53,640.72 = 20,217.12/x
3. Step 3: Cross multiply
   35,790.72x = 53,640.72 × 20,217.12
4. Step 4: Simplify right side
   35,790.72x = 1,084,460,873.13
5. Step 5: Solve for x
   x = 1,084,460,873.13/35,790.72
6. Step 6: Final answer
   x = 30,300.06