Finding the Fourth Proportional to 9,139.23, 12,613.83 and 5,779.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.23 : 12,613.83 = 5,779.76 : x
2. Step 2: Convert to fraction form
   9,139.23/12,613.83 = 5,779.76/x
3. Step 3: Cross multiply
   9,139.23x = 12,613.83 × 5,779.76
4. Step 4: Simplify right side
   9,139.23x = 72,904,825.34
5. Step 5: Solve for x
   x = 72,904,825.34/9,139.23
6. Step 6: Final answer
   x = 7,977.13