Finding the Fourth Proportional to 139,871.28, 209,806.73 and 64,950.46

Step by Step Solution

1. Step 1: Write the proportion equation
   139,871.28 : 209,806.73 = 64,950.46 : x
2. Step 2: Convert to fraction form
   139,871.28/209,806.73 = 64,950.46/x
3. Step 3: Cross multiply
   139,871.28x = 209,806.73 × 64,950.46
4. Step 4: Simplify right side
   139,871.28x = 13,627,043,201.56
5. Step 5: Solve for x
   x = 13,627,043,201.56/139,871.28
6. Step 6: Final answer
   x = 97,425.60