Finding the Fourth Proportional to 139,409.40, 208,996.58 and 60,464.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,409.40 : 208,996.58 = 60,464.18 : x
2. Step 2: Convert to fraction form
   139,409.40/208,996.58 = 60,464.18/x
3. Step 3: Cross multiply
   139,409.40x = 208,996.58 × 60,464.18
4. Step 4: Simplify right side
   139,409.40x = 12,636,806,832.50
5. Step 5: Solve for x
   x = 12,636,806,832.50/139,409.40
6. Step 6: Final answer
   x = 90,645.30