Finding the Fourth Proportional to 9,891.34, 13,649.61 and 5,415.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,891.34 : 13,649.61 = 5,415.18 : x
2. Step 2: Convert to fraction form
   9,891.34/13,649.61 = 5,415.18/x
3. Step 3: Cross multiply
   9,891.34x = 13,649.61 × 5,415.18
4. Step 4: Simplify right side
   9,891.34x = 73,915,095.08
5. Step 5: Solve for x
   x = 73,915,095.08/9,891.34
6. Step 6: Final answer
   x = 7,472.71