Finding the Fourth Proportional to 42,457.80, 63,626.34 and 31,276.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,457.80 : 63,626.34 = 31,276.56 : x
2. Step 2: Convert to fraction form
   42,457.80/63,626.34 = 31,276.56/x
3. Step 3: Cross multiply
   42,457.80x = 63,626.34 × 31,276.56
4. Step 4: Simplify right side
   42,457.80x = 1,990,013,040.59
5. Step 5: Solve for x
   x = 1,990,013,040.59/42,457.80
6. Step 6: Final answer
   x = 46,870.38