Finding the Fourth Proportional to 12,948.39, 17,865.72 and 9,405.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,948.39 : 17,865.72 = 9,405.45 : x
2. Step 2: Convert to fraction form
   12,948.39/17,865.72 = 9,405.45/x
3. Step 3: Cross multiply
   12,948.39x = 17,865.72 × 9,405.45
4. Step 4: Simplify right side
   12,948.39x = 168,035,136.17
5. Step 5: Solve for x
   x = 168,035,136.17/12,948.39
6. Step 6: Final answer
   x = 12,977.30