Finding the Fourth Proportional to 21,460, 29,608.28 and 13,510.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,460 : 29,608.28 = 13,510.16 : x
2. Step 2: Convert to fraction form
   21,460/29,608.28 = 13,510.16/x
3. Step 3: Cross multiply
   21,460x = 29,608.28 × 13,510.16
4. Step 4: Simplify right side
   21,460x = 400,012,600.12
5. Step 5: Solve for x
   x = 400,012,600.12/21,460
6. Step 6: Final answer
   x = 18,639.92