Finding the Fourth Proportional to 139,594.30, 209,269.94 and 89,688.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,594.30 : 209,269.94 = 89,688.58 : x
2. Step 2: Convert to fraction form
   139,594.30/209,269.94 = 89,688.58/x
3. Step 3: Cross multiply
   139,594.30x = 209,269.94 × 89,688.58
4. Step 4: Simplify right side
   139,594.30x = 18,769,122,708.94
5. Step 5: Solve for x
   x = 18,769,122,708.94/139,594.30
6. Step 6: Final answer
   x = 134,454.80