Finding the Fourth Proportional to 101,036.96, 139,419.72 and 64,721.84

Step by Step Solution

1. Step 1: Write the proportion equation
   101,036.96 : 139,419.72 = 64,721.84 : x
2. Step 2: Convert to fraction form
   101,036.96/139,419.72 = 64,721.84/x
3. Step 3: Cross multiply
   101,036.96x = 139,419.72 × 64,721.84
4. Step 4: Simplify right side
   101,036.96x = 9,023,500,810.68
5. Step 5: Solve for x
   x = 9,023,500,810.68/101,036.96
6. Step 6: Final answer
   x = 89,308.91