Finding the Fourth Proportional to 9,611.89, 13,264.41 and 5,420.14

Step by Step Solution

1. Step 1: Write the proportion equation
   9,611.89 : 13,264.41 = 5,420.14 : x
2. Step 2: Convert to fraction form
   9,611.89/13,264.41 = 5,420.14/x
3. Step 3: Cross multiply
   9,611.89x = 13,264.41 × 5,420.14
4. Step 4: Simplify right side
   9,611.89x = 71,894,959.22
5. Step 5: Solve for x
   x = 71,894,959.22/9,611.89
6. Step 6: Final answer
   x = 7,479.79