Finding the Fourth Proportional to 101,011.88, 139,388.60 and 55,689.72

Step by Step Solution

1. Step 1: Write the proportion equation
   101,011.88 : 139,388.60 = 55,689.72 : x
2. Step 2: Convert to fraction form
   101,011.88/139,388.60 = 55,689.72/x
3. Step 3: Cross multiply
   101,011.88x = 139,388.60 × 55,689.72
4. Step 4: Simplify right side
   101,011.88x = 7,762,511,826.74
5. Step 5: Solve for x
   x = 7,762,511,826.74/101,011.88
6. Step 6: Final answer
   x = 76,847.52