Finding the Fourth Proportional to 101,297.67, 139,790.25 and 55,978.80

Step by Step Solution

1. Step 1: Write the proportion equation
   101,297.67 : 139,790.25 = 55,978.80 : x
2. Step 2: Convert to fraction form
   101,297.67/139,790.25 = 55,978.80/x
3. Step 3: Cross multiply
   101,297.67x = 139,790.25 × 55,978.80
4. Step 4: Simplify right side
   101,297.67x = 7,825,290,446.70
5. Step 5: Solve for x
   x = 7,825,290,446.70/101,297.67
6. Step 6: Final answer
   x = 77,250.45