Finding the Fourth Proportional to 9,611.56, 13,263.30 and 5,419.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,611.56 : 13,263.30 = 5,419.72 : x
2. Step 2: Convert to fraction form
   9,611.56/13,263.30 = 5,419.72/x
3. Step 3: Cross multiply
   9,611.56x = 13,263.30 × 5,419.72
4. Step 4: Simplify right side
   9,611.56x = 71,883,372.28
5. Step 5: Solve for x
   x = 71,883,372.28/9,611.56
6. Step 6: Final answer
   x = 7,478.85