Finding the Fourth Proportional to 139,405.14, 208,990.17 and 60,459.93

Step by Step Solution

1. Step 1: Write the proportion equation
   139,405.14 : 208,990.17 = 60,459.93 : x
2. Step 2: Convert to fraction form
   139,405.14/208,990.17 = 60,459.93/x
3. Step 3: Cross multiply
   139,405.14x = 208,990.17 × 60,459.93
4. Step 4: Simplify right side
   139,405.14x = 12,635,531,048.89
5. Step 5: Solve for x
   x = 12,635,531,048.89/139,405.14
6. Step 6: Final answer
   x = 90,638.92