Finding the Fourth Proportional to 139,953.76, 193,131.30 and 76,290.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,953.76 : 193,131.30 = 76,290.28 : x
2. Step 2: Convert to fraction form
   139,953.76/193,131.30 = 76,290.28/x
3. Step 3: Cross multiply
   139,953.76x = 193,131.30 × 76,290.28
4. Step 4: Simplify right side
   139,953.76x = 14,734,040,953.76
5. Step 5: Solve for x
   x = 14,734,040,953.76/139,953.76
6. Step 6: Final answer
   x = 105,277.92