Finding the Fourth Proportional to 31,588.38, 43,598.79 and 21,540.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,588.38 : 43,598.79 = 21,540.80 : x
2. Step 2: Convert to fraction form
   31,588.38/43,598.79 = 21,540.80/x
3. Step 3: Cross multiply
   31,588.38x = 43,598.79 × 21,540.80
4. Step 4: Simplify right side
   31,588.38x = 939,152,924.63
5. Step 5: Solve for x
   x = 939,152,924.63/31,588.38
6. Step 6: Final answer
   x = 29,730.96