Finding the Fourth Proportional to 11,109.30, 16,672.05 and 7,828.80

Step by Step Solution

1. Step 1: Write the proportion equation
   11,109.30 : 16,672.05 = 7,828.80 : x
2. Step 2: Convert to fraction form
   11,109.30/16,672.05 = 7,828.80/x
3. Step 3: Cross multiply
   11,109.30x = 16,672.05 × 7,828.80
4. Step 4: Simplify right side
   11,109.30x = 130,522,145.04
5. Step 5: Solve for x
   x = 130,522,145.04/11,109.30
6. Step 6: Final answer
   x = 11,748.91