Finding the Fourth Proportional to 12,400.01, 17,103.52 and 7,921.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,400.01 : 17,103.52 = 7,921.78 : x
2. Step 2: Convert to fraction form
   12,400.01/17,103.52 = 7,921.78/x
3. Step 3: Cross multiply
   12,400.01x = 17,103.52 × 7,921.78
4. Step 4: Simplify right side
   12,400.01x = 135,490,289.81
5. Step 5: Solve for x
   x = 135,490,289.81/12,400.01
6. Step 6: Final answer
   x = 10,926.63