Finding the Fourth Proportional to 11,180.42, 15,412.72 and 7,812.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,180.42 : 15,412.72 = 7,812.78 : x
2. Step 2: Convert to fraction form
   11,180.42/15,412.72 = 7,812.78/x
3. Step 3: Cross multiply
   11,180.42x = 15,412.72 × 7,812.78
4. Step 4: Simplify right side
   11,180.42x = 120,416,171.16
5. Step 5: Solve for x
   x = 120,416,171.16/11,180.42
6. Step 6: Final answer
   x = 10,770.27