Finding the Fourth Proportional to 42,912.16, 64,309.90 and 31,860.52

Step by Step Solution

1. Step 1: Write the proportion equation
   42,912.16 : 64,309.90 = 31,860.52 : x
2. Step 2: Convert to fraction form
   42,912.16/64,309.90 = 31,860.52/x
3. Step 3: Cross multiply
   42,912.16x = 64,309.90 × 31,860.52
4. Step 4: Simplify right side
   42,912.16x = 2,048,946,855.15
5. Step 5: Solve for x
   x = 2,048,946,855.15/42,912.16
6. Step 6: Final answer
   x = 47,747.46