Finding the Fourth Proportional to 13,373.89, 18,454.57 and 7,405.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,373.89 : 18,454.57 = 7,405.40 : x
2. Step 2: Convert to fraction form
   13,373.89/18,454.57 = 7,405.40/x
3. Step 3: Cross multiply
   13,373.89x = 18,454.57 × 7,405.40
4. Step 4: Simplify right side
   13,373.89x = 136,663,500.30
5. Step 5: Solve for x
   x = 136,663,500.30/13,373.89
6. Step 6: Final answer
   x = 10,218.68