Finding the Fourth Proportional to 21,012.89, 31,336.13 and 19,848.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,012.89 : 31,336.13 = 19,848.31 : x
2. Step 2: Convert to fraction form
   21,012.89/31,336.13 = 19,848.31/x
3. Step 3: Cross multiply
   21,012.89x = 31,336.13 × 19,848.31
4. Step 4: Simplify right side
   21,012.89x = 621,969,193.72
5. Step 5: Solve for x
   x = 621,969,193.72/21,012.89
6. Step 6: Final answer
   x = 29,599.42