Finding the Fourth Proportional to 13,120.18, 18,095.61 and 8,404.90

Step by Step Solution

1. Step 1: Write the proportion equation
   13,120.18 : 18,095.61 = 8,404.90 : x
2. Step 2: Convert to fraction form
   13,120.18/18,095.61 = 8,404.90/x
3. Step 3: Cross multiply
   13,120.18x = 18,095.61 × 8,404.90
4. Step 4: Simplify right side
   13,120.18x = 152,091,792.49
5. Step 5: Solve for x
   x = 152,091,792.49/13,120.18
6. Step 6: Final answer
   x = 11,592.20