Finding the Fourth Proportional to 9,003.66, 12,421.58 and 5,640.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,003.66 : 12,421.58 = 5,640.62 : x
2. Step 2: Convert to fraction form
   9,003.66/12,421.58 = 5,640.62/x
3. Step 3: Cross multiply
   9,003.66x = 12,421.58 × 5,640.62
4. Step 4: Simplify right side
   9,003.66x = 70,065,364.57
5. Step 5: Solve for x
   x = 70,065,364.57/9,003.66
6. Step 6: Final answer
   x = 7,781.88