Finding the Fourth Proportional to 82,765.10, 123,824.72 and 72,689.87

Step by Step Solution

1. Step 1: Write the proportion equation
   82,765.10 : 123,824.72 = 72,689.87 : x
2. Step 2: Convert to fraction form
   82,765.10/123,824.72 = 72,689.87/x
3. Step 3: Cross multiply
   82,765.10x = 123,824.72 × 72,689.87
4. Step 4: Simplify right side
   82,765.10x = 9,000,801,817.01
5. Step 5: Solve for x
   x = 9,000,801,817.01/82,765.10
6. Step 6: Final answer
   x = 108,751.18