Finding the Fourth Proportional to 51,217.49, 70,684.78 and 31,079.47

Step by Step Solution

1. Step 1: Write the proportion equation
   51,217.49 : 70,684.78 = 31,079.47 : x
2. Step 2: Convert to fraction form
   51,217.49/70,684.78 = 31,079.47/x
3. Step 3: Cross multiply
   51,217.49x = 70,684.78 × 31,079.47
4. Step 4: Simplify right side
   51,217.49x = 2,196,845,499.47
5. Step 5: Solve for x
   x = 2,196,845,499.47/51,217.49
6. Step 6: Final answer
   x = 42,892.49