Finding the Fourth Proportional to 9,983.31, 13,777.05 and 5,507.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,983.31 : 13,777.05 = 5,507.21 : x
2. Step 2: Convert to fraction form
   9,983.31/13,777.05 = 5,507.21/x
3. Step 3: Cross multiply
   9,983.31x = 13,777.05 × 5,507.21
4. Step 4: Simplify right side
   9,983.31x = 75,873,141.97
5. Step 5: Solve for x
   x = 75,873,141.97/9,983.31
6. Step 6: Final answer
   x = 7,600.00