Finding the Fourth Proportional to 139,407.39, 208,993.59 and 60,462.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,407.39 : 208,993.59 = 60,462.18 : x
2. Step 2: Convert to fraction form
   139,407.39/208,993.59 = 60,462.18/x
3. Step 3: Cross multiply
   139,407.39x = 208,993.59 × 60,462.18
4. Step 4: Simplify right side
   139,407.39x = 12,636,208,057.43
5. Step 5: Solve for x
   x = 12,636,208,057.43/139,407.39
6. Step 6: Final answer
   x = 90,642.31