Finding the Fourth Proportional to 12,406.86, 17,120.58 and 7,101.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,406.86 : 17,120.58 = 7,101.60 : x
2. Step 2: Convert to fraction form
   12,406.86/17,120.58 = 7,101.60/x
3. Step 3: Cross multiply
   12,406.86x = 17,120.58 × 7,101.60
4. Step 4: Simplify right side
   12,406.86x = 121,583,510.93
5. Step 5: Solve for x
   x = 121,583,510.93/12,406.86
6. Step 6: Final answer
   x = 9,799.70