Finding the Fourth Proportional to 13,300.53, 19,916.20 and 12,906.11

Step by Step Solution

1. Step 1: Write the proportion equation
   13,300.53 : 19,916.20 = 12,906.11 : x
2. Step 2: Convert to fraction form
   13,300.53/19,916.20 = 12,906.11/x
3. Step 3: Cross multiply
   13,300.53x = 19,916.20 × 12,906.11
4. Step 4: Simplify right side
   13,300.53x = 257,040,714.19
5. Step 5: Solve for x
   x = 257,040,714.19/13,300.53
6. Step 6: Final answer
   x = 19,325.60