Finding the Fourth Proportional to 10,422.16, 15,618.68 and 7,486.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,422.16 : 15,618.68 = 7,486.72 : x
2. Step 2: Convert to fraction form
   10,422.16/15,618.68 = 7,486.72/x
3. Step 3: Cross multiply
   10,422.16x = 15,618.68 × 7,486.72
4. Step 4: Simplify right side
   10,422.16x = 116,932,683.93
5. Step 5: Solve for x
   x = 116,932,683.93/10,422.16
6. Step 6: Final answer
   x = 11,219.62