Finding the Fourth Proportional to 17,280.64, 23,858.76 and 13,294.72

Step by Step Solution

1. Step 1: Write the proportion equation
   17,280.64 : 23,858.76 = 13,294.72 : x
2. Step 2: Convert to fraction form
   17,280.64/23,858.76 = 13,294.72/x
3. Step 3: Cross multiply
   17,280.64x = 23,858.76 × 13,294.72
4. Step 4: Simplify right side
   17,280.64x = 317,195,533.75
5. Step 5: Solve for x
   x = 317,195,533.75/17,280.64
6. Step 6: Final answer
   x = 18,355.54