Finding the Fourth Proportional to 38,138.56, 52,630.38 and 21,142.72

Step by Step Solution

1. Step 1: Write the proportion equation
   38,138.56 : 52,630.38 = 21,142.72 : x
2. Step 2: Convert to fraction form
   38,138.56/52,630.38 = 21,142.72/x
3. Step 3: Cross multiply
   38,138.56x = 52,630.38 × 21,142.72
4. Step 4: Simplify right side
   38,138.56x = 1,112,749,387.83
5. Step 5: Solve for x
   x = 1,112,749,387.83/38,138.56
6. Step 6: Final answer
   x = 29,176.49