Finding the Fourth Proportional to 9,072.84, 12,521.90 and 5,538.11

Step by Step Solution

1. Step 1: Write the proportion equation
   9,072.84 : 12,521.90 = 5,538.11 : x
2. Step 2: Convert to fraction form
   9,072.84/12,521.90 = 5,538.11/x
3. Step 3: Cross multiply
   9,072.84x = 12,521.90 × 5,538.11
4. Step 4: Simplify right side
   9,072.84x = 69,347,569.31
5. Step 5: Solve for x
   x = 69,347,569.31/9,072.84
6. Step 6: Final answer
   x = 7,643.42