Finding the Fourth Proportional to 5,688.89, 8,531.60 and 1,990.43

Step by Step Solution

1. Step 1: Write the proportion equation
   5,688.89 : 8,531.60 = 1,990.43 : x
2. Step 2: Convert to fraction form
   5,688.89/8,531.60 = 1,990.43/x
3. Step 3: Cross multiply
   5,688.89x = 8,531.60 × 1,990.43
4. Step 4: Simplify right side
   5,688.89x = 16,981,499.98
5. Step 5: Solve for x
   x = 16,981,499.98/5,688.89
6. Step 6: Final answer
   x = 2,985.03