Finding the Fourth Proportional to 42,895.55, 64,321.38 and 17,928.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,895.55 : 64,321.38 = 17,928.78 : x
2. Step 2: Convert to fraction form
   42,895.55/64,321.38 = 17,928.78/x
3. Step 3: Cross multiply
   42,895.55x = 64,321.38 × 17,928.78
4. Step 4: Simplify right side
   42,895.55x = 1,153,203,871.32
5. Step 5: Solve for x
   x = 1,153,203,871.32/42,895.55
6. Step 6: Final answer
   x = 26,884.00