Finding the Fourth Proportional to 22,790.04, 34,164.27 and 7,990.80

Step by Step Solution

1. Step 1: Write the proportion equation
   22,790.04 : 34,164.27 = 7,990.80 : x
2. Step 2: Convert to fraction form
   22,790.04/34,164.27 = 7,990.80/x
3. Step 3: Cross multiply
   22,790.04x = 34,164.27 × 7,990.80
4. Step 4: Simplify right side
   22,790.04x = 272,999,848.72
5. Step 5: Solve for x
   x = 272,999,848.72/22,790.04
6. Step 6: Final answer
   x = 11,978.91