Finding the Fourth Proportional to 31,012.54, 42,709.89 and 30,915.34

Step by Step Solution

1. Step 1: Write the proportion equation
   31,012.54 : 42,709.89 = 30,915.34 : x
2. Step 2: Convert to fraction form
   31,012.54/42,709.89 = 30,915.34/x
3. Step 3: Cross multiply
   31,012.54x = 42,709.89 × 30,915.34
4. Step 4: Simplify right side
   31,012.54x = 1,320,390,770.71
5. Step 5: Solve for x
   x = 1,320,390,770.71/31,012.54
6. Step 6: Final answer
   x = 42,576.03