Finding the Fourth Proportional to 55,878.56, 77,110.89 and 30,728.06

Step by Step Solution

1. Step 1: Write the proportion equation
   55,878.56 : 77,110.89 = 30,728.06 : x
2. Step 2: Convert to fraction form
   55,878.56/77,110.89 = 30,728.06/x
3. Step 3: Cross multiply
   55,878.56x = 77,110.89 × 30,728.06
4. Step 4: Simplify right side
   55,878.56x = 2,369,468,054.57
5. Step 5: Solve for x
   x = 2,369,468,054.57/55,878.56
6. Step 6: Final answer
   x = 42,403.89