Finding the Fourth Proportional to 101,145.65, 139,502.10 and 64,850.56

Step by Step Solution

1. Step 1: Write the proportion equation
   101,145.65 : 139,502.10 = 64,850.56 : x
2. Step 2: Convert to fraction form
   101,145.65/139,502.10 = 64,850.56/x
3. Step 3: Cross multiply
   101,145.65x = 139,502.10 × 64,850.56
4. Step 4: Simplify right side
   101,145.65x = 9,046,788,835.83
5. Step 5: Solve for x
   x = 9,046,788,835.83/101,145.65
6. Step 6: Final answer
   x = 89,443.19