Finding the Fourth Proportional to 43,274.73, 64,905.60 and 13,688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   43,274.73 : 64,905.60 = 13,688.72 : x
2. Step 2: Convert to fraction form
   43,274.73/64,905.60 = 13,688.72/x
3. Step 3: Cross multiply
   43,274.73x = 64,905.60 × 13,688.72
4. Step 4: Simplify right side
   43,274.73x = 888,474,404.35
5. Step 5: Solve for x
   x = 888,474,404.35/43,274.73
6. Step 6: Final answer
   x = 20,531.02