Finding the Fourth Proportional to 9,611.21, 13,262.46 and 5,631.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,611.21 : 13,262.46 = 5,631.57 : x
2. Step 2: Convert to fraction form
   9,611.21/13,262.46 = 5,631.57/x
3. Step 3: Cross multiply
   9,611.21x = 13,262.46 × 5,631.57
4. Step 4: Simplify right side
   9,611.21x = 74,688,471.86
5. Step 5: Solve for x
   x = 74,688,471.86/9,611.21
6. Step 6: Final answer
   x = 7,770.98