Finding the Fourth Proportional to 11,355.60, 17,038.13 and 5,111.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,355.60 : 17,038.13 = 5,111.31 : x
2. Step 2: Convert to fraction form
   11,355.60/17,038.13 = 5,111.31/x
3. Step 3: Cross multiply
   11,355.60x = 17,038.13 × 5,111.31
4. Step 4: Simplify right side
   11,355.60x = 87,087,138.69
5. Step 5: Solve for x
   x = 87,087,138.69/11,355.60
6. Step 6: Final answer
   x = 7,669.09