Finding the Fourth Proportional to 139,787.15, 209,600.78 and 64,868.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,787.15 : 209,600.78 = 64,868.76 : x
2. Step 2: Convert to fraction form
   139,787.15/209,600.78 = 64,868.76/x
3. Step 3: Cross multiply
   139,787.15x = 209,600.78 × 64,868.76
4. Step 4: Simplify right side
   139,787.15x = 13,596,542,369.29
5. Step 5: Solve for x
   x = 13,596,542,369.29/139,787.15
6. Step 6: Final answer
   x = 97,266.04