Finding the Fourth Proportional to 35,918.47, 53,885 and 12,561.31

Step by Step Solution

1. Step 1: Write the proportion equation
   35,918.47 : 53,885 = 12,561.31 : x
2. Step 2: Convert to fraction form
   35,918.47/53,885 = 12,561.31/x
3. Step 3: Cross multiply
   35,918.47x = 53,885 × 12,561.31
4. Step 4: Simplify right side
   35,918.47x = 676,866,189.35
5. Step 5: Solve for x
   x = 676,866,189.35/35,918.47
6. Step 6: Final answer
   x = 18,844.52