Finding the Fourth Proportional to 9,892.21, 13,650.69 and 5,415.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,892.21 : 13,650.69 = 5,415.09 : x
2. Step 2: Convert to fraction form
   9,892.21/13,650.69 = 5,415.09/x
3. Step 3: Cross multiply
   9,892.21x = 13,650.69 × 5,415.09
4. Step 4: Simplify right side
   9,892.21x = 73,919,714.91
5. Step 5: Solve for x
   x = 73,919,714.91/9,892.21
6. Step 6: Final answer
   x = 7,472.52