Finding the Fourth Proportional to 73,747.28, 110,638.69 and 21,156.31

Step by Step Solution

1. Step 1: Write the proportion equation
   73,747.28 : 110,638.69 = 21,156.31 : x
2. Step 2: Convert to fraction form
   73,747.28/110,638.69 = 21,156.31/x
3. Step 3: Cross multiply
   73,747.28x = 110,638.69 × 21,156.31
4. Step 4: Simplify right side
   73,747.28x = 2,340,706,423.63
5. Step 5: Solve for x
   x = 2,340,706,423.63/73,747.28
6. Step 6: Final answer
   x = 31,739.56