Finding the Fourth Proportional to 9,121.72, 12,587.34 and 5,395

Step by Step Solution

1. Step 1: Write the proportion equation
   9,121.72 : 12,587.34 = 5,395 : x
2. Step 2: Convert to fraction form
   9,121.72/12,587.34 = 5,395/x
3. Step 3: Cross multiply
   9,121.72x = 12,587.34 × 5,395
4. Step 4: Simplify right side
   9,121.72x = 67,908,699.30
5. Step 5: Solve for x
   x = 67,908,699.30/9,121.72
6. Step 6: Final answer
   x = 7,444.73