Finding the Fourth Proportional to 42,872.49, 64,133.78 and 34,561.89

Step by Step Solution

1. Step 1: Write the proportion equation
   42,872.49 : 64,133.78 = 34,561.89 : x
2. Step 2: Convert to fraction form
   42,872.49/64,133.78 = 34,561.89/x
3. Step 3: Cross multiply
   42,872.49x = 64,133.78 × 34,561.89
4. Step 4: Simplify right side
   42,872.49x = 2,216,584,476.83
5. Step 5: Solve for x
   x = 2,216,584,476.83/42,872.49
6. Step 6: Final answer
   x = 51,701.79