Finding the Fourth Proportional to 9,686.79, 13,366.62 and 5,438.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,686.79 : 13,366.62 = 5,438.07 : x
2. Step 2: Convert to fraction form
   9,686.79/13,366.62 = 5,438.07/x
3. Step 3: Cross multiply
   9,686.79x = 13,366.62 × 5,438.07
4. Step 4: Simplify right side
   9,686.79x = 72,688,615.22
5. Step 5: Solve for x
   x = 72,688,615.22/9,686.79
6. Step 6: Final answer
   x = 7,503.89