Finding the Fourth Proportional to 101,101.98, 139,521.21 and 55,780.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,101.98 : 139,521.21 = 55,780.50 : x
2. Step 2: Convert to fraction form
   101,101.98/139,521.21 = 55,780.50/x
3. Step 3: Cross multiply
   101,101.98x = 139,521.21 × 55,780.50
4. Step 4: Simplify right side
   101,101.98x = 7,782,562,854.41
5. Step 5: Solve for x
   x = 7,782,562,854.41/101,101.98
6. Step 6: Final answer
   x = 76,977.35