Finding the Fourth Proportional to 39,779.30, 54,895.56 and 21,875.42

Step by Step Solution

1. Step 1: Write the proportion equation
   39,779.30 : 54,895.56 = 21,875.42 : x
2. Step 2: Convert to fraction form
   39,779.30/54,895.56 = 21,875.42/x
3. Step 3: Cross multiply
   39,779.30x = 54,895.56 × 21,875.42
4. Step 4: Simplify right side
   39,779.30x = 1,200,863,431.14
5. Step 5: Solve for x
   x = 1,200,863,431.14/39,779.30
6. Step 6: Final answer
   x = 30,188.15