Finding the Fourth Proportional to 35,978.13, 49,636.79 and 20,862.47

Step by Step Solution

1. Step 1: Write the proportion equation
   35,978.13 : 49,636.79 = 20,862.47 : x
2. Step 2: Convert to fraction form
   35,978.13/49,636.79 = 20,862.47/x
3. Step 3: Cross multiply
   35,978.13x = 49,636.79 × 20,862.47
4. Step 4: Simplify right side
   35,978.13x = 1,035,546,042.27
5. Step 5: Solve for x
   x = 1,035,546,042.27/35,978.13
6. Step 6: Final answer
   x = 28,782.65