Finding the Fourth Proportional to 22,985.42, 34,458.37 and 7,990.57

Step by Step Solution

1. Step 1: Write the proportion equation
   22,985.42 : 34,458.37 = 7,990.57 : x
2. Step 2: Convert to fraction form
   22,985.42/34,458.37 = 7,990.57/x
3. Step 3: Cross multiply
   22,985.42x = 34,458.37 × 7,990.57
4. Step 4: Simplify right side
   22,985.42x = 275,341,997.59
5. Step 5: Solve for x
   x = 275,341,997.59/22,985.42
6. Step 6: Final answer
   x = 11,978.99