Finding the Fourth Proportional to 51,135.69, 70,548.52 and 30,978.03

Step by Step Solution

1. Step 1: Write the proportion equation
   51,135.69 : 70,548.52 = 30,978.03 : x
2. Step 2: Convert to fraction form
   51,135.69/70,548.52 = 30,978.03/x
3. Step 3: Cross multiply
   51,135.69x = 70,548.52 × 30,978.03
4. Step 4: Simplify right side
   51,135.69x = 2,185,454,169.02
5. Step 5: Solve for x
   x = 2,185,454,169.02/51,135.69
6. Step 6: Final answer
   x = 42,738.33