Finding the Fourth Proportional to 12,386.72, 17,095.65 and 9,558.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,386.72 : 17,095.65 = 9,558.20 : x
2. Step 2: Convert to fraction form
   12,386.72/17,095.65 = 9,558.20/x
3. Step 3: Cross multiply
   12,386.72x = 17,095.65 × 9,558.20
4. Step 4: Simplify right side
   12,386.72x = 163,403,641.83
5. Step 5: Solve for x
   x = 163,403,641.83/12,386.72
6. Step 6: Final answer
   x = 13,191.84