Finding the Fourth Proportional to 108,423.30, 162,404.55 and 89,991.30

Step by Step Solution

1. Step 1: Write the proportion equation
   108,423.30 : 162,404.55 = 89,991.30 : x
2. Step 2: Convert to fraction form
   108,423.30/162,404.55 = 89,991.30/x
3. Step 3: Cross multiply
   108,423.30x = 162,404.55 × 89,991.30
4. Step 4: Simplify right side
   108,423.30x = 14,614,996,580.42
5. Step 5: Solve for x
   x = 14,614,996,580.42/108,423.30
6. Step 6: Final answer
   x = 134,795.72