Finding the Fourth Proportional to 89,689, 123,770.82 and 51,985.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89,689 : 123,770.82 = 51,985.12 : x
2. Step 2: Convert to fraction form
   89,689/123,770.82 = 51,985.12/x
3. Step 3: Cross multiply
   89,689x = 123,770.82 × 51,985.12
4. Step 4: Simplify right side
   89,689x = 6,434,240,930.20
5. Step 5: Solve for x
   x = 6,434,240,930.20/89,689
6. Step 6: Final answer
   x = 71,739.47