Finding the Fourth Proportional to 22,390.51, 30,698.65 and 21,990.69

Step by Step Solution

1. Step 1: Write the proportion equation
   22,390.51 : 30,698.65 = 21,990.69 : x
2. Step 2: Convert to fraction form
   22,390.51/30,698.65 = 21,990.69/x
3. Step 3: Cross multiply
   22,390.51x = 30,698.65 × 21,990.69
4. Step 4: Simplify right side
   22,390.51x = 675,084,440.59
5. Step 5: Solve for x
   x = 675,084,440.59/22,390.51
6. Step 6: Final answer
   x = 30,150.48