Finding the Fourth Proportional to 9,899.10, 14,840.43 and 5,216.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899.10 : 14,840.43 = 5,216.49 : x
2. Step 2: Convert to fraction form
   9,899.10/14,840.43 = 5,216.49/x
3. Step 3: Cross multiply
   9,899.10x = 14,840.43 × 5,216.49
4. Step 4: Simplify right side
   9,899.10x = 77,414,954.69
5. Step 5: Solve for x
   x = 77,414,954.69/9,899.10
6. Step 6: Final answer
   x = 7,820.40