Finding the Fourth Proportional to 31,116.96, 42,953.76 and 21,040.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,116.96 : 42,953.76 = 21,040.56 : x
2. Step 2: Convert to fraction form
   31,116.96/42,953.76 = 21,040.56/x
3. Step 3: Cross multiply
   31,116.96x = 42,953.76 × 21,040.56
4. Step 4: Simplify right side
   31,116.96x = 903,771,164.51
5. Step 5: Solve for x
   x = 903,771,164.51/31,116.96
6. Step 6: Final answer
   x = 29,044.33