Finding the Fourth Proportional to 12,898.32, 17,780.52 and 9,109.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,898.32 : 17,780.52 = 9,109.08 : x
2. Step 2: Convert to fraction form
   12,898.32/17,780.52 = 9,109.08/x
3. Step 3: Cross multiply
   12,898.32x = 17,780.52 × 9,109.08
4. Step 4: Simplify right side
   12,898.32x = 161,964,179.12
5. Step 5: Solve for x
   x = 161,964,179.12/12,898.32
6. Step 6: Final answer
   x = 12,557.00