Finding the Fourth Proportional to 9,100.43, 12,558.05 and 5,121.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,100.43 : 12,558.05 = 5,121.38 : x
2. Step 2: Convert to fraction form
   9,100.43/12,558.05 = 5,121.38/x
3. Step 3: Cross multiply
   9,100.43x = 12,558.05 × 5,121.38
4. Step 4: Simplify right side
   9,100.43x = 64,314,496.12
5. Step 5: Solve for x
   x = 64,314,496.12/9,100.43
6. Step 6: Final answer
   x = 7,067.20