Finding the Fourth Proportional to 31,815.91, 43,889.34 and 21,603.34

Step by Step Solution

1. Step 1: Write the proportion equation
   31,815.91 : 43,889.34 = 21,603.34 : x
2. Step 2: Convert to fraction form
   31,815.91/43,889.34 = 21,603.34/x
3. Step 3: Cross multiply
   31,815.91x = 43,889.34 × 21,603.34
4. Step 4: Simplify right side
   31,815.91x = 948,156,334.40
5. Step 5: Solve for x
   x = 948,156,334.40/31,815.91
6. Step 6: Final answer
   x = 29,801.33