Finding the Fourth Proportional to 55,181.05, 76,149.90 and 30,978.70

Step by Step Solution

1. Step 1: Write the proportion equation
   55,181.05 : 76,149.90 = 30,978.70 : x
2. Step 2: Convert to fraction form
   55,181.05/76,149.90 = 30,978.70/x
3. Step 3: Cross multiply
   55,181.05x = 76,149.90 × 30,978.70
4. Step 4: Simplify right side
   55,181.05x = 2,359,025,057.97
5. Step 5: Solve for x
   x = 2,359,025,057.97/55,181.05
6. Step 6: Final answer
   x = 42,750.64