Finding the Fourth Proportional to 57,834.32, 79,779.48 and 39,938.72

Step by Step Solution

1. Step 1: Write the proportion equation
   57,834.32 : 79,779.48 = 39,938.72 : x
2. Step 2: Convert to fraction form
   57,834.32/79,779.48 = 39,938.72/x
3. Step 3: Cross multiply
   57,834.32x = 79,779.48 × 39,938.72
4. Step 4: Simplify right side
   57,834.32x = 3,186,290,313.47
5. Step 5: Solve for x
   x = 3,186,290,313.47/57,834.32
6. Step 6: Final answer
   x = 55,093.42