Finding the Fourth Proportional to 9,111.40, 12,574.92 and 5,133.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.40 : 12,574.92 = 5,133.28 : x
2. Step 2: Convert to fraction form
   9,111.40/12,574.92 = 5,133.28/x
3. Step 3: Cross multiply
   9,111.40x = 12,574.92 × 5,133.28
4. Step 4: Simplify right side
   9,111.40x = 64,550,585.34
5. Step 5: Solve for x
   x = 64,550,585.34/9,111.40
6. Step 6: Final answer
   x = 7,084.60