Finding the Fourth Proportional to 42,835.20, 64,271.10 and 17,880.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,835.20 : 64,271.10 = 17,880.78 : x
2. Step 2: Convert to fraction form
   42,835.20/64,271.10 = 17,880.78/x
3. Step 3: Cross multiply
   42,835.20x = 64,271.10 × 17,880.78
4. Step 4: Simplify right side
   42,835.20x = 1,149,217,399.46
5. Step 5: Solve for x
   x = 1,149,217,399.46/42,835.20
6. Step 6: Final answer
   x = 26,828.81