Finding the Fourth Proportional to 9,117.30, 12,738.30 and 9,117.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,117.30 : 12,738.30 = 9,117.30 : x
2. Step 2: Convert to fraction form
   9,117.30/12,738.30 = 9,117.30/x
3. Step 3: Cross multiply
   9,117.30x = 12,738.30 × 9,117.30
4. Step 4: Simplify right side
   9,117.30x = 116,138,902.59
5. Step 5: Solve for x
   x = 116,138,902.59/9,117.30
6. Step 6: Final answer
   x = 12,738.30