Finding the Fourth Proportional to 9,339.10, 12,875.56 and 7,739.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,339.10 : 12,875.56 = 7,739.75 : x
2. Step 2: Convert to fraction form
   9,339.10/12,875.56 = 7,739.75/x
3. Step 3: Cross multiply
   9,339.10x = 12,875.56 × 7,739.75
4. Step 4: Simplify right side
   9,339.10x = 99,653,628.35
5. Step 5: Solve for x
   x = 99,653,628.35/9,339.10
6. Step 6: Final answer
   x = 10,670.58