Finding the Fourth Proportional to 12,391.03, 17,100.64 and 7,086.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391.03 : 17,100.64 = 7,086.87 : x
2. Step 2: Convert to fraction form
   12,391.03/17,100.64 = 7,086.87/x
3. Step 3: Cross multiply
   12,391.03x = 17,100.64 × 7,086.87
4. Step 4: Simplify right side
   12,391.03x = 121,190,012.60
5. Step 5: Solve for x
   x = 121,190,012.60/12,391.03
6. Step 6: Final answer
   x = 9,780.46