Finding the Fourth Proportional to 9,487.61, 13,080.73 and 7,779.83

Step by Step Solution

1. Step 1: Write the proportion equation
   9,487.61 : 13,080.73 = 7,779.83 : x
2. Step 2: Convert to fraction form
   9,487.61/13,080.73 = 7,779.83/x
3. Step 3: Cross multiply
   9,487.61x = 13,080.73 × 7,779.83
4. Step 4: Simplify right side
   9,487.61x = 101,765,790.27
5. Step 5: Solve for x
   x = 101,765,790.27/9,487.61
6. Step 6: Final answer
   x = 10,726.18