Finding the Fourth Proportional to 9,649.71, 13,315.89 and 5,400.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,649.71 : 13,315.89 = 5,400.21 : x
2. Step 2: Convert to fraction form
   9,649.71/13,315.89 = 5,400.21/x
3. Step 3: Cross multiply
   9,649.71x = 13,315.89 × 5,400.21
4. Step 4: Simplify right side
   9,649.71x = 71,908,602.34
5. Step 5: Solve for x
   x = 71,908,602.34/9,649.71
6. Step 6: Final answer
   x = 7,451.89