Finding the Fourth Proportional to 42,951.74, 64,361.85 and 17,978.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,951.74 : 64,361.85 = 17,978.20 : x
2. Step 2: Convert to fraction form
   42,951.74/64,361.85 = 17,978.20/x
3. Step 3: Cross multiply
   42,951.74x = 64,361.85 × 17,978.20
4. Step 4: Simplify right side
   42,951.74x = 1,157,110,050.77
5. Step 5: Solve for x
   x = 1,157,110,050.77/42,951.74
6. Step 6: Final answer
   x = 26,939.77