Finding the Fourth Proportional to 109,688.10, 164,240.55 and 109,688.10

Step by Step Solution

1. Step 1: Write the proportion equation
   109,688.10 : 164,240.55 = 109,688.10 : x
2. Step 2: Convert to fraction form
   109,688.10/164,240.55 = 109,688.10/x
3. Step 3: Cross multiply
   109,688.10x = 164,240.55 × 109,688.10
4. Step 4: Simplify right side
   109,688.10x = 18,015,233,872.46
5. Step 5: Solve for x
   x = 18,015,233,872.46/109,688.10
6. Step 6: Final answer
   x = 164,240.55