Finding the Fourth Proportional to 139,519.47, 209,274.57 and 60,633.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,519.47 : 209,274.57 = 60,633.78 : x
2. Step 2: Convert to fraction form
   139,519.47/209,274.57 = 60,633.78/x
3. Step 3: Cross multiply
   139,519.47x = 209,274.57 × 60,633.78
4. Step 4: Simplify right side
   139,519.47x = 12,689,108,236.97
5. Step 5: Solve for x
   x = 12,689,108,236.97/139,519.47
6. Step 6: Final answer
   x = 90,948.66