Finding the Fourth Proportional to 55,978.76, 77,251.72 and 30,485.88

Step by Step Solution

1. Step 1: Write the proportion equation
   55,978.76 : 77,251.72 = 30,485.88 : x
2. Step 2: Convert to fraction form
   55,978.76/77,251.72 = 30,485.88/x
3. Step 3: Cross multiply
   55,978.76x = 77,251.72 × 30,485.88
4. Step 4: Simplify right side
   55,978.76x = 2,355,086,665.71
5. Step 5: Solve for x
   x = 2,355,086,665.71/55,978.76
6. Step 6: Final answer
   x = 42,071.08