Finding the Fourth Proportional to 31,393.98, 47,012.67 and 21,989.88

Step by Step Solution

1. Step 1: Write the proportion equation
   31,393.98 : 47,012.67 = 21,989.88 : x
2. Step 2: Convert to fraction form
   31,393.98/47,012.67 = 21,989.88/x
3. Step 3: Cross multiply
   31,393.98x = 47,012.67 × 21,989.88
4. Step 4: Simplify right side
   31,393.98x = 1,033,802,971.78
5. Step 5: Solve for x
   x = 1,033,802,971.78/31,393.98
6. Step 6: Final answer
   x = 32,929.97