Finding the Fourth Proportional to 50,837.76, 70,139.28 and 30,687

Step by Step Solution

1. Step 1: Write the proportion equation
   50,837.76 : 70,139.28 = 30,687 : x
2. Step 2: Convert to fraction form
   50,837.76/70,139.28 = 30,687/x
3. Step 3: Cross multiply
   50,837.76x = 70,139.28 × 30,687
4. Step 4: Simplify right side
   50,837.76x = 2,152,364,085.36
5. Step 5: Solve for x
   x = 2,152,364,085.36/50,837.76
6. Step 6: Final answer
   x = 42,337.90