Finding the Fourth Proportional to 12,849.65, 17,730.45 and 7,811.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,849.65 : 17,730.45 = 7,811.18 : x
2. Step 2: Convert to fraction form
   12,849.65/17,730.45 = 7,811.18/x
3. Step 3: Cross multiply
   12,849.65x = 17,730.45 × 7,811.18
4. Step 4: Simplify right side
   12,849.65x = 138,495,647.78
5. Step 5: Solve for x
   x = 138,495,647.78/12,849.65
6. Step 6: Final answer
   x = 10,778.17