Finding the Fourth Proportional to 7,221.31, 10,836.29 and 3,117.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,221.31 : 10,836.29 = 3,117.31 : x
2. Step 2: Convert to fraction form
   7,221.31/10,836.29 = 3,117.31/x
3. Step 3: Cross multiply
   7,221.31x = 10,836.29 × 3,117.31
4. Step 4: Simplify right side
   7,221.31x = 33,780,075.18
5. Step 5: Solve for x
   x = 33,780,075.18/7,221.31
6. Step 6: Final answer
   x = 4,677.83