Finding the Fourth Proportional to 39,780.18, 54,897.33 and 21,875.94

Step by Step Solution

1. Step 1: Write the proportion equation
   39,780.18 : 54,897.33 = 21,875.94 : x
2. Step 2: Convert to fraction form
   39,780.18/54,897.33 = 21,875.94/x
3. Step 3: Cross multiply
   39,780.18x = 54,897.33 × 21,875.94
4. Step 4: Simplify right side
   39,780.18x = 1,200,930,697.24
5. Step 5: Solve for x
   x = 1,200,930,697.24/39,780.18
6. Step 6: Final answer
   x = 30,189.17