Finding the Fourth Proportional to 101,103.48, 139,523.40 and 55,780.74

Step by Step Solution

1. Step 1: Write the proportion equation
   101,103.48 : 139,523.40 = 55,780.74 : x
2. Step 2: Convert to fraction form
   101,103.48/139,523.40 = 55,780.74/x
3. Step 3: Cross multiply
   101,103.48x = 139,523.40 × 55,780.74
4. Step 4: Simplify right side
   101,103.48x = 7,782,718,499.32
5. Step 5: Solve for x
   x = 7,782,718,499.32/101,103.48
6. Step 6: Final answer
   x = 76,977.75