Finding the Fourth Proportional to 8,109.30, 12,156.60 and 2,913.96

Step by Step Solution

1. Step 1: Write the proportion equation
   8,109.30 : 12,156.60 = 2,913.96 : x
2. Step 2: Convert to fraction form
   8,109.30/12,156.60 = 2,913.96/x
3. Step 3: Cross multiply
   8,109.30x = 12,156.60 × 2,913.96
4. Step 4: Simplify right side
   8,109.30x = 35,423,846.14
5. Step 5: Solve for x
   x = 35,423,846.14/8,109.30
6. Step 6: Final answer
   x = 4,368.30