Finding the Fourth Proportional to 38,761.20, 53,492.82 and 21,771

Step by Step Solution

1. Step 1: Write the proportion equation
   38,761.20 : 53,492.82 = 21,771 : x
2. Step 2: Convert to fraction form
   38,761.20/53,492.82 = 21,771/x
3. Step 3: Cross multiply
   38,761.20x = 53,492.82 × 21,771
4. Step 4: Simplify right side
   38,761.20x = 1,164,592,184.22
5. Step 5: Solve for x
   x = 1,164,592,184.22/38,761.20
6. Step 6: Final answer
   x = 30,045.31