Finding the Fourth Proportional to 13,091.30, 19,604.55 and 8,404.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.30 : 19,604.55 = 8,404.10 : x
2. Step 2: Convert to fraction form
   13,091.30/19,604.55 = 8,404.10/x
3. Step 3: Cross multiply
   13,091.30x = 19,604.55 × 8,404.10
4. Step 4: Simplify right side
   13,091.30x = 164,758,598.66
5. Step 5: Solve for x
   x = 164,758,598.66/13,091.30
6. Step 6: Final answer
   x = 12,585.35