Finding the Fourth Proportional to 31,531.50, 43,513.83 and 21,985.38

Step by Step Solution

1. Step 1: Write the proportion equation
   31,531.50 : 43,513.83 = 21,985.38 : x
2. Step 2: Convert to fraction form
   31,531.50/43,513.83 = 21,985.38/x
3. Step 3: Cross multiply
   31,531.50x = 43,513.83 × 21,985.38
4. Step 4: Simplify right side
   31,531.50x = 956,668,087.81
5. Step 5: Solve for x
   x = 956,668,087.81/31,531.50
6. Step 6: Final answer
   x = 30,340.08