Finding the Fourth Proportional to 101,036.56, 139,406.07 and 65,218.90

Step by Step Solution

1. Step 1: Write the proportion equation
   101,036.56 : 139,406.07 = 65,218.90 : x
2. Step 2: Convert to fraction form
   101,036.56/139,406.07 = 65,218.90/x
3. Step 3: Cross multiply
   101,036.56x = 139,406.07 × 65,218.90
4. Step 4: Simplify right side
   101,036.56x = 9,091,910,538.72
5. Step 5: Solve for x
   x = 9,091,910,538.72/101,036.56
6. Step 6: Final answer
   x = 89,986.34