Finding the Fourth Proportional to 30,689, 42,350.87 and 18,113.75

Step by Step Solution

1. Step 1: Write the proportion equation
   30,689 : 42,350.87 = 18,113.75 : x
2. Step 2: Convert to fraction form
   30,689/42,350.87 = 18,113.75/x
3. Step 3: Cross multiply
   30,689x = 42,350.87 × 18,113.75
4. Step 4: Simplify right side
   30,689x = 767,132,980.89
5. Step 5: Solve for x
   x = 767,132,980.89/30,689
6. Step 6: Final answer
   x = 24,997.00