Finding the Fourth Proportional to 90,078, 124,336.80 and 56,544

Step by Step Solution

1. Step 1: Write the proportion equation
   90,078 : 124,336.80 = 56,544 : x
2. Step 2: Convert to fraction form
   90,078/124,336.80 = 56,544/x
3. Step 3: Cross multiply
   90,078x = 124,336.80 × 56,544
4. Step 4: Simplify right side
   90,078x = 7,030,500,019.20
5. Step 5: Solve for x
   x = 7,030,500,019.20/90,078
6. Step 6: Final answer
   x = 78,049.02