Finding the Fourth Proportional to 139,392.78, 208,572.48 and 83,263.43

Step by Step Solution

1. Step 1: Write the proportion equation
   139,392.78 : 208,572.48 = 83,263.43 : x
2. Step 2: Convert to fraction form
   139,392.78/208,572.48 = 83,263.43/x
3. Step 3: Cross multiply
   139,392.78x = 208,572.48 × 83,263.43
4. Step 4: Simplify right side
   139,392.78x = 17,366,459,045.54
5. Step 5: Solve for x
   x = 17,366,459,045.54/139,392.78
6. Step 6: Final answer
   x = 124,586.50