Finding the Fourth Proportional to 12,808.10, 17,672.50 and 7,774.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,808.10 : 17,672.50 = 7,774.96 : x
2. Step 2: Convert to fraction form
   12,808.10/17,672.50 = 7,774.96/x
3. Step 3: Cross multiply
   12,808.10x = 17,672.50 × 7,774.96
4. Step 4: Simplify right side
   12,808.10x = 137,402,980.60
5. Step 5: Solve for x
   x = 137,402,980.60/12,808.10
6. Step 6: Final answer
   x = 10,727.82