Finding the Fourth Proportional to 63,138.72, 87,128.04 and 39,264.72

Step by Step Solution

1. Step 1: Write the proportion equation
   63,138.72 : 87,128.04 = 39,264.72 : x
2. Step 2: Convert to fraction form
   63,138.72/87,128.04 = 39,264.72/x
3. Step 3: Cross multiply
   63,138.72x = 87,128.04 × 39,264.72
4. Step 4: Simplify right side
   63,138.72x = 3,421,058,094.75
5. Step 5: Solve for x
   x = 3,421,058,094.75/63,138.72
6. Step 6: Final answer
   x = 54,183.20