Finding the Fourth Proportional to 11,368.72, 15,684.42 and 7,118.05

Step by Step Solution

1. Step 1: Write the proportion equation
   11,368.72 : 15,684.42 = 7,118.05 : x
2. Step 2: Convert to fraction form
   11,368.72/15,684.42 = 7,118.05/x
3. Step 3: Cross multiply
   11,368.72x = 15,684.42 × 7,118.05
4. Step 4: Simplify right side
   11,368.72x = 111,642,485.78
5. Step 5: Solve for x
   x = 111,642,485.78/11,368.72
6. Step 6: Final answer
   x = 9,820.15