Finding the Fourth Proportional to 10,122, 15,181.38 and 7,191.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,122 : 15,181.38 = 7,191.42 : x
2. Step 2: Convert to fraction form
   10,122/15,181.38 = 7,191.42/x
3. Step 3: Cross multiply
   10,122x = 15,181.38 × 7,191.42
4. Step 4: Simplify right side
   10,122x = 109,175,679.76
5. Step 5: Solve for x
   x = 109,175,679.76/10,122
6. Step 6: Final answer
   x = 10,785.98