Finding the Fourth Proportional to 9,870.12, 13,622.31 and 5,890.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.12 : 13,622.31 = 5,890.47 : x
2. Step 2: Convert to fraction form
   9,870.12/13,622.31 = 5,890.47/x
3. Step 3: Cross multiply
   9,870.12x = 13,622.31 × 5,890.47
4. Step 4: Simplify right side
   9,870.12x = 80,241,808.39
5. Step 5: Solve for x
   x = 80,241,808.39/9,870.12
6. Step 6: Final answer
   x = 8,129.77