Finding the Fourth Proportional to 8,390.34, 12,591.54 and 5,622.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,390.34 : 12,591.54 = 5,622.30 : x
2. Step 2: Convert to fraction form
   8,390.34/12,591.54 = 5,622.30/x
3. Step 3: Cross multiply
   8,390.34x = 12,591.54 × 5,622.30
4. Step 4: Simplify right side
   8,390.34x = 70,793,415.34
5. Step 5: Solve for x
   x = 70,793,415.34/8,390.34
6. Step 6: Final answer
   x = 8,437.49