Finding the Fourth Proportional to 10,930.34, 15,090.09 and 7,215.14

Step by Step Solution

1. Step 1: Write the proportion equation
   10,930.34 : 15,090.09 = 7,215.14 : x
2. Step 2: Convert to fraction form
   10,930.34/15,090.09 = 7,215.14/x
3. Step 3: Cross multiply
   10,930.34x = 15,090.09 × 7,215.14
4. Step 4: Simplify right side
   10,930.34x = 108,877,111.96
5. Step 5: Solve for x
   x = 108,877,111.96/10,930.34
6. Step 6: Final answer
   x = 9,961.00