Finding the Fourth Proportional to 10,419.32, 15,615.38 and 9,099.94

Step by Step Solution

1. Step 1: Write the proportion equation
   10,419.32 : 15,615.38 = 9,099.94 : x
2. Step 2: Convert to fraction form
   10,419.32/15,615.38 = 9,099.94/x
3. Step 3: Cross multiply
   10,419.32x = 15,615.38 × 9,099.94
4. Step 4: Simplify right side
   10,419.32x = 142,098,943.00
5. Step 5: Solve for x
   x = 142,098,943.00/10,419.32
6. Step 6: Final answer
   x = 13,638.03