Finding the Fourth Proportional to 21,577.32, 29,769.56 and 12,618.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,577.32 : 29,769.56 = 12,618.48 : x
2. Step 2: Convert to fraction form
   21,577.32/29,769.56 = 12,618.48/x
3. Step 3: Cross multiply
   21,577.32x = 29,769.56 × 12,618.48
4. Step 4: Simplify right side
   21,577.32x = 375,646,693.33
5. Step 5: Solve for x
   x = 375,646,693.33/21,577.32
6. Step 6: Final answer
   x = 17,409.33