Finding the Fourth Proportional to 139,942.50, 193,117.78 and 76,279.74

Step by Step Solution

1. Step 1: Write the proportion equation
   139,942.50 : 193,117.78 = 76,279.74 : x
2. Step 2: Convert to fraction form
   139,942.50/193,117.78 = 76,279.74/x
3. Step 3: Cross multiply
   139,942.50x = 193,117.78 × 76,279.74
4. Step 4: Simplify right side
   139,942.50x = 14,730,974,047.78
5. Step 5: Solve for x
   x = 14,730,974,047.78/139,942.50
6. Step 6: Final answer
   x = 105,264.48