Finding the Fourth Proportional to 35,443.20, 53,139.20 and 19,865.60

Step by Step Solution

1. Step 1: Write the proportion equation
   35,443.20 : 53,139.20 = 19,865.60 : x
2. Step 2: Convert to fraction form
   35,443.20/53,139.20 = 19,865.60/x
3. Step 3: Cross multiply
   35,443.20x = 53,139.20 × 19,865.60
4. Step 4: Simplify right side
   35,443.20x = 1,055,642,091.52
5. Step 5: Solve for x
   x = 1,055,642,091.52/35,443.20
6. Step 6: Final answer
   x = 29,784.05