Finding the Fourth Proportional to 55,780.84, 76,978.92 and 30,630.34

Step by Step Solution

1. Step 1: Write the proportion equation
   55,780.84 : 76,978.92 = 30,630.34 : x
2. Step 2: Convert to fraction form
   55,780.84/76,978.92 = 30,630.34/x
3. Step 3: Cross multiply
   55,780.84x = 76,978.92 × 30,630.34
4. Step 4: Simplify right side
   55,780.84x = 2,357,890,492.43
5. Step 5: Solve for x
   x = 2,357,890,492.43/55,780.84
6. Step 6: Final answer
   x = 42,270.62