Finding the Fourth Proportional to 12,385.91, 17,090.16 and 7,079.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,385.91 : 17,090.16 = 7,079.60 : x
2. Step 2: Convert to fraction form
   12,385.91/17,090.16 = 7,079.60/x
3. Step 3: Cross multiply
   12,385.91x = 17,090.16 × 7,079.60
4. Step 4: Simplify right side
   12,385.91x = 120,991,411.29
5. Step 5: Solve for x
   x = 120,991,411.29/12,385.91
6. Step 6: Final answer
   x = 9,768.48