Finding the Fourth Proportional to 10,150.76, 15,220.38 and 7,409

Step by Step Solution

1. Step 1: Write the proportion equation
   10,150.76 : 15,220.38 = 7,409 : x
2. Step 2: Convert to fraction form
   10,150.76/15,220.38 = 7,409/x
3. Step 3: Cross multiply
   10,150.76x = 15,220.38 × 7,409
4. Step 4: Simplify right side
   10,150.76x = 112,767,795.42
5. Step 5: Solve for x
   x = 112,767,795.42/10,150.76
6. Step 6: Final answer
   x = 11,109.30