Finding the Fourth Proportional to 82,537.72, 123,877.28 and 81,916.45

Step by Step Solution

1. Step 1: Write the proportion equation
   82,537.72 : 123,877.28 = 81,916.45 : x
2. Step 2: Convert to fraction form
   82,537.72/123,877.28 = 81,916.45/x
3. Step 3: Cross multiply
   82,537.72x = 123,877.28 × 81,916.45
4. Step 4: Simplify right side
   82,537.72x = 10,147,587,220.55
5. Step 5: Solve for x
   x = 10,147,587,220.55/82,537.72
6. Step 6: Final answer
   x = 122,944.84