Finding the Fourth Proportional to 35,981.64, 53,972.79 and 13,789.72

Step by Step Solution

1. Step 1: Write the proportion equation
   35,981.64 : 53,972.79 = 13,789.72 : x
2. Step 2: Convert to fraction form
   35,981.64/53,972.79 = 13,789.72/x
3. Step 3: Cross multiply
   35,981.64x = 53,972.79 × 13,789.72
4. Step 4: Simplify right side
   35,981.64x = 744,269,661.72
5. Step 5: Solve for x
   x = 744,269,661.72/35,981.64
6. Step 6: Final answer
   x = 20,684.71