Finding the Fourth Proportional to 9,913.34, 13,680.32 and 5,721.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,913.34 : 13,680.32 = 5,721.50 : x
2. Step 2: Convert to fraction form
   9,913.34/13,680.32 = 5,721.50/x
3. Step 3: Cross multiply
   9,913.34x = 13,680.32 × 5,721.50
4. Step 4: Simplify right side
   9,913.34x = 78,271,950.88
5. Step 5: Solve for x
   x = 78,271,950.88/9,913.34
6. Step 6: Final answer
   x = 7,895.62