Finding the Fourth Proportional to 13,233.30, 19,866.15 and 13,136.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,233.30 : 19,866.15 = 13,136.10 : x
2. Step 2: Convert to fraction form
   13,233.30/19,866.15 = 13,136.10/x
3. Step 3: Cross multiply
   13,233.30x = 19,866.15 × 13,136.10
4. Step 4: Simplify right side
   13,233.30x = 260,963,733.02
5. Step 5: Solve for x
   x = 260,963,733.02/13,233.30
6. Step 6: Final answer
   x = 19,720.23