Finding the Fourth Proportional to 42,876, 64,355.60 and 20,704.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,876 : 64,355.60 = 20,704.96 : x
2. Step 2: Convert to fraction form
   42,876/64,355.60 = 20,704.96/x
3. Step 3: Cross multiply
   42,876x = 64,355.60 × 20,704.96
4. Step 4: Simplify right side
   42,876x = 1,332,480,123.78
5. Step 5: Solve for x
   x = 1,332,480,123.78/42,876
6. Step 6: Final answer
   x = 31,077.53