Finding the Fourth Proportional to 20,411.48, 30,602.82 and 7,921.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,411.48 : 30,602.82 = 7,921.10 : x
2. Step 2: Convert to fraction form
   20,411.48/30,602.82 = 7,921.10/x
3. Step 3: Cross multiply
   20,411.48x = 30,602.82 × 7,921.10
4. Step 4: Simplify right side
   20,411.48x = 242,407,997.50
5. Step 5: Solve for x
   x = 242,407,997.50/20,411.48
6. Step 6: Final answer
   x = 11,876.06