Finding the Fourth Proportional to 31,477.09, 47,262.17 and 21,012.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,477.09 : 47,262.17 = 21,012.31 : x
2. Step 2: Convert to fraction form
   31,477.09/47,262.17 = 21,012.31/x
3. Step 3: Cross multiply
   31,477.09x = 47,262.17 × 21,012.31
4. Step 4: Simplify right side
   31,477.09x = 993,087,367.31
5. Step 5: Solve for x
   x = 993,087,367.31/31,477.09
6. Step 6: Final answer
   x = 31,549.53