Finding the Fourth Proportional to 15,429.30, 23,111.55 and 12,837.30

Step by Step Solution

1. Step 1: Write the proportion equation
   15,429.30 : 23,111.55 = 12,837.30 : x
2. Step 2: Convert to fraction form
   15,429.30/23,111.55 = 12,837.30/x
3. Step 3: Cross multiply
   15,429.30x = 23,111.55 × 12,837.30
4. Step 4: Simplify right side
   15,429.30x = 296,689,900.82
5. Step 5: Solve for x
   x = 296,689,900.82/15,429.30
6. Step 6: Final answer
   x = 19,228.99