Finding the Fourth Proportional to 13,074.15, 19,609.60 and 7,740.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,074.15 : 19,609.60 = 7,740.50 : x
2. Step 2: Convert to fraction form
   13,074.15/19,609.60 = 7,740.50/x
3. Step 3: Cross multiply
   13,074.15x = 19,609.60 × 7,740.50
4. Step 4: Simplify right side
   13,074.15x = 151,788,108.80
5. Step 5: Solve for x
   x = 151,788,108.80/13,074.15
6. Step 6: Final answer
   x = 11,609.79