Finding the Fourth Proportional to 39,222.50, 54,126.72 and 21,317.61

Step by Step Solution

1. Step 1: Write the proportion equation
   39,222.50 : 54,126.72 = 21,317.61 : x
2. Step 2: Convert to fraction form
   39,222.50/54,126.72 = 21,317.61/x
3. Step 3: Cross multiply
   39,222.50x = 54,126.72 × 21,317.61
4. Step 4: Simplify right side
   39,222.50x = 1,153,852,307.54
5. Step 5: Solve for x
   x = 1,153,852,307.54/39,222.50
6. Step 6: Final answer
   x = 29,418.12