Finding the Fourth Proportional to 9,300.78, 12,835.02 and 5,109

Step by Step Solution

1. Step 1: Write the proportion equation
   9,300.78 : 12,835.02 = 5,109 : x
2. Step 2: Convert to fraction form
   9,300.78/12,835.02 = 5,109/x
3. Step 3: Cross multiply
   9,300.78x = 12,835.02 × 5,109
4. Step 4: Simplify right side
   9,300.78x = 65,574,117.18
5. Step 5: Solve for x
   x = 65,574,117.18/9,300.78
6. Step 6: Final answer
   x = 7,050.39