Finding the Fourth Proportional to 100,741.83, 139,020.74 and 55,419.80

Step by Step Solution

1. Step 1: Write the proportion equation
   100,741.83 : 139,020.74 = 55,419.80 : x
2. Step 2: Convert to fraction form
   100,741.83/139,020.74 = 55,419.80/x
3. Step 3: Cross multiply
   100,741.83x = 139,020.74 × 55,419.80
4. Step 4: Simplify right side
   100,741.83x = 7,704,500,842.27
5. Step 5: Solve for x
   x = 7,704,500,842.27/100,741.83
6. Step 6: Final answer
   x = 76,477.68