Finding the Fourth Proportional to 42,912.56, 64,346.88 and 17,945.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,912.56 : 64,346.88 = 17,945.78 : x
2. Step 2: Convert to fraction form
   42,912.56/64,346.88 = 17,945.78/x
3. Step 3: Cross multiply
   42,912.56x = 64,346.88 × 17,945.78
4. Step 4: Simplify right side
   42,912.56x = 1,154,754,952.17
5. Step 5: Solve for x
   x = 1,154,754,952.17/42,912.56
6. Step 6: Final answer
   x = 26,909.49