Finding the Fourth Proportional to 139,015.62, 208,362.06 and 63,978.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139,015.62 : 208,362.06 = 63,978.24 : x
2. Step 2: Convert to fraction form
   139,015.62/208,362.06 = 63,978.24/x
3. Step 3: Cross multiply
   139,015.62x = 208,362.06 × 63,978.24
4. Step 4: Simplify right side
   139,015.62x = 13,330,637,881.57
5. Step 5: Solve for x
   x = 13,330,637,881.57/139,015.62
6. Step 6: Final answer
   x = 95,893.09