Finding the Fourth Proportional to 139,618.42, 192,587.02 and 121,756.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,618.42 : 192,587.02 = 121,756.30 : x
2. Step 2: Convert to fraction form
   139,618.42/192,587.02 = 121,756.30/x
3. Step 3: Cross multiply
   139,618.42x = 192,587.02 × 121,756.30
4. Step 4: Simplify right side
   139,618.42x = 23,448,682,983.23
5. Step 5: Solve for x
   x = 23,448,682,983.23/139,618.42
6. Step 6: Final answer
   x = 167,948.35