Finding the Fourth Proportional to 139,440.96, 208,940.04 and 83,148.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,440.96 : 208,940.04 = 83,148.12 : x
2. Step 2: Convert to fraction form
   139,440.96/208,940.04 = 83,148.12/x
3. Step 3: Cross multiply
   139,440.96x = 208,940.04 × 83,148.12
4. Step 4: Simplify right side
   139,440.96x = 17,372,971,518.72
5. Step 5: Solve for x
   x = 17,372,971,518.72/139,440.96
6. Step 6: Final answer
   x = 124,590.16