Finding the Fourth Proportional to 9,315.03, 12,856.56 and 5,338.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.03 : 12,856.56 = 5,338.80 : x
2. Step 2: Convert to fraction form
   9,315.03/12,856.56 = 5,338.80/x
3. Step 3: Cross multiply
   9,315.03x = 12,856.56 × 5,338.80
4. Step 4: Simplify right side
   9,315.03x = 68,638,602.53
5. Step 5: Solve for x
   x = 68,638,602.53/9,315.03
6. Step 6: Final answer
   x = 7,368.59