Finding the Fourth Proportional to 7,809.59, 10,781.69 and 5,164.67

Step by Step Solution

1. Step 1: Write the proportion equation
   7,809.59 : 10,781.69 = 5,164.67 : x
2. Step 2: Convert to fraction form
   7,809.59/10,781.69 = 5,164.67/x
3. Step 3: Cross multiply
   7,809.59x = 10,781.69 × 5,164.67
4. Step 4: Simplify right side
   7,809.59x = 55,683,870.89
5. Step 5: Solve for x
   x = 55,683,870.89/7,809.59
6. Step 6: Final answer
   x = 7,130.19