Finding the Fourth Proportional to 10,899.96, 15,041.42 and 7,121.30

Step by Step Solution

1. Step 1: Write the proportion equation
   10,899.96 : 15,041.42 = 7,121.30 : x
2. Step 2: Convert to fraction form
   10,899.96/15,041.42 = 7,121.30/x
3. Step 3: Cross multiply
   10,899.96x = 15,041.42 × 7,121.30
4. Step 4: Simplify right side
   10,899.96x = 107,114,464.25
5. Step 5: Solve for x
   x = 107,114,464.25/10,899.96
6. Step 6: Final answer
   x = 9,827.05