Finding the Fourth Proportional to 55,931.50, 77,186.69 and 30,781

Step by Step Solution

1. Step 1: Write the proportion equation
   55,931.50 : 77,186.69 = 30,781 : x
2. Step 2: Convert to fraction form
   55,931.50/77,186.69 = 30,781/x
3. Step 3: Cross multiply
   55,931.50x = 77,186.69 × 30,781
4. Step 4: Simplify right side
   55,931.50x = 2,375,883,504.89
5. Step 5: Solve for x
   x = 2,375,883,504.89/55,931.50
6. Step 6: Final answer
   x = 42,478.45