Finding the Fourth Proportional to 57,719.83, 79,654.61 and 31,878.30

Step by Step Solution

1. Step 1: Write the proportion equation
   57,719.83 : 79,654.61 = 31,878.30 : x
2. Step 2: Convert to fraction form
   57,719.83/79,654.61 = 31,878.30/x
3. Step 3: Cross multiply
   57,719.83x = 79,654.61 × 31,878.30
4. Step 4: Simplify right side
   57,719.83x = 2,539,253,553.96
5. Step 5: Solve for x
   x = 2,539,253,553.96/57,719.83
6. Step 6: Final answer
   x = 43,992.74