Finding the Fourth Proportional to 13,602.72, 18,808.56 and 12,972

Step by Step Solution

1. Step 1: Write the proportion equation
   13,602.72 : 18,808.56 = 12,972 : x
2. Step 2: Convert to fraction form
   13,602.72/18,808.56 = 12,972/x
3. Step 3: Cross multiply
   13,602.72x = 18,808.56 × 12,972
4. Step 4: Simplify right side
   13,602.72x = 243,984,640.32
5. Step 5: Solve for x
   x = 243,984,640.32/13,602.72
6. Step 6: Final answer
   x = 17,936.46