Finding the Fourth Proportional to 9,141.71, 12,606.61 and 5,557.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,141.71 : 12,606.61 = 5,557.16 : x
2. Step 2: Convert to fraction form
   9,141.71/12,606.61 = 5,557.16/x
3. Step 3: Cross multiply
   9,141.71x = 12,606.61 × 5,557.16
4. Step 4: Simplify right side
   9,141.71x = 70,056,921.59
5. Step 5: Solve for x
   x = 70,056,921.59/9,141.71
6. Step 6: Final answer
   x = 7,663.44