Finding the Fourth Proportional to 215,636.18, 323,516.73 and 89,253.09

Step by Step Solution

1. Step 1: Write the proportion equation
   215,636.18 : 323,516.73 = 89,253.09 : x
2. Step 2: Convert to fraction form
   215,636.18/323,516.73 = 89,253.09/x
3. Step 3: Cross multiply
   215,636.18x = 323,516.73 × 89,253.09
4. Step 4: Simplify right side
   215,636.18x = 28,874,868,153.89
5. Step 5: Solve for x
   x = 28,874,868,153.89/215,636.18
6. Step 6: Final answer
   x = 133,905.49