Finding the Fourth Proportional to 9,721.89, 13,400.78 and 7,359.93

Step by Step Solution

1. Step 1: Write the proportion equation
   9,721.89 : 13,400.78 = 7,359.93 : x
2. Step 2: Convert to fraction form
   9,721.89/13,400.78 = 7,359.93/x
3. Step 3: Cross multiply
   9,721.89x = 13,400.78 × 7,359.93
4. Step 4: Simplify right side
   9,721.89x = 98,628,765.95
5. Step 5: Solve for x
   x = 98,628,765.95/9,721.89
6. Step 6: Final answer
   x = 10,145.02