Finding the Fourth Proportional to 101,990.56, 140,745.72 and 57,278.56

Step by Step Solution

1. Step 1: Write the proportion equation
   101,990.56 : 140,745.72 = 57,278.56 : x
2. Step 2: Convert to fraction form
   101,990.56/140,745.72 = 57,278.56/x
3. Step 3: Cross multiply
   101,990.56x = 140,745.72 × 57,278.56
4. Step 4: Simplify right side
   101,990.56x = 8,061,712,167.76
5. Step 5: Solve for x
   x = 8,061,712,167.76/101,990.56
6. Step 6: Final answer
   x = 79,043.71