Finding the Fourth Proportional to 31,053.77, 42,904.31 and 21,664.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,053.77 : 42,904.31 = 21,664.25 : x
2. Step 2: Convert to fraction form
   31,053.77/42,904.31 = 21,664.25/x
3. Step 3: Cross multiply
   31,053.77x = 42,904.31 × 21,664.25
4. Step 4: Simplify right side
   31,053.77x = 929,489,589.60
5. Step 5: Solve for x
   x = 929,489,589.60/31,053.77
6. Step 6: Final answer
   x = 29,931.62