Finding the Fourth Proportional to 22,815.58, 31,412.31 and 19,870.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,815.58 : 31,412.31 = 19,870.30 : x
2. Step 2: Convert to fraction form
   22,815.58/31,412.31 = 19,870.30/x
3. Step 3: Cross multiply
   22,815.58x = 31,412.31 × 19,870.30
4. Step 4: Simplify right side
   22,815.58x = 624,172,023.39
5. Step 5: Solve for x
   x = 624,172,023.39/22,815.58
6. Step 6: Final answer
   x = 27,357.27