Finding the Fourth Proportional to 7,583.49, 10,470.06 and 7,215.21

Step by Step Solution

1. Step 1: Write the proportion equation
   7,583.49 : 10,470.06 = 7,215.21 : x
2. Step 2: Convert to fraction form
   7,583.49/10,470.06 = 7,215.21/x
3. Step 3: Cross multiply
   7,583.49x = 10,470.06 × 7,215.21
4. Step 4: Simplify right side
   7,583.49x = 75,543,681.61
5. Step 5: Solve for x
   x = 75,543,681.61/7,583.49
6. Step 6: Final answer
   x = 9,961.60