Finding the Fourth Proportional to 139,648.32, 192,780 and 89,376.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,648.32 : 192,780 = 89,376.48 : x
2. Step 2: Convert to fraction form
   139,648.32/192,780 = 89,376.48/x
3. Step 3: Cross multiply
   139,648.32x = 192,780 × 89,376.48
4. Step 4: Simplify right side
   139,648.32x = 17,229,997,814.40
5. Step 5: Solve for x
   x = 17,229,997,814.40/139,648.32
6. Step 6: Final answer
   x = 123,381.35