Finding the Fourth Proportional to 17,626.64, 26,388.72 and 13,719.20

Step by Step Solution

1. Step 1: Write the proportion equation
   17,626.64 : 26,388.72 = 13,719.20 : x
2. Step 2: Convert to fraction form
   17,626.64/26,388.72 = 13,719.20/x
3. Step 3: Cross multiply
   17,626.64x = 26,388.72 × 13,719.20
4. Step 4: Simplify right side
   17,626.64x = 362,032,127.42
5. Step 5: Solve for x
   x = 362,032,127.42/17,626.64
6. Step 6: Final answer
   x = 20,538.92