Finding the Fourth Proportional to 31,106.52, 43,108.53 and 30,515.76

Step by Step Solution

1. Step 1: Write the proportion equation
   31,106.52 : 43,108.53 = 30,515.76 : x
2. Step 2: Convert to fraction form
   31,106.52/43,108.53 = 30,515.76/x
3. Step 3: Cross multiply
   31,106.52x = 43,108.53 × 30,515.76
4. Step 4: Simplify right side
   31,106.52x = 1,315,489,555.43
5. Step 5: Solve for x
   x = 1,315,489,555.43/31,106.52
6. Step 6: Final answer
   x = 42,289.83