Finding the Fourth Proportional to 31,044.21, 42,841.96 and 21,985.81

Step by Step Solution

1. Step 1: Write the proportion equation
   31,044.21 : 42,841.96 = 21,985.81 : x
2. Step 2: Convert to fraction form
   31,044.21/42,841.96 = 21,985.81/x
3. Step 3: Cross multiply
   31,044.21x = 42,841.96 × 21,985.81
4. Step 4: Simplify right side
   31,044.21x = 941,914,978.38
5. Step 5: Solve for x
   x = 941,914,978.38/31,044.21
6. Step 6: Final answer
   x = 30,341.08