Finding the Fourth Proportional to 35,906.32, 53,835.18 and 12,520

Step by Step Solution

1. Step 1: Write the proportion equation
   35,906.32 : 53,835.18 = 12,520 : x
2. Step 2: Convert to fraction form
   35,906.32/53,835.18 = 12,520/x
3. Step 3: Cross multiply
   35,906.32x = 53,835.18 × 12,520
4. Step 4: Simplify right side
   35,906.32x = 674,016,453.60
5. Step 5: Solve for x
   x = 674,016,453.60/35,906.32
6. Step 6: Final answer
   x = 18,771.53