Finding the Fourth Proportional to 139,900.64, 193,065.12 and 76,238.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,900.64 : 193,065.12 = 76,238.48 : x
2. Step 2: Convert to fraction form
   139,900.64/193,065.12 = 76,238.48/x
3. Step 3: Cross multiply
   139,900.64x = 193,065.12 × 76,238.48
4. Step 4: Simplify right side
   139,900.64x = 14,718,991,289.82
5. Step 5: Solve for x
   x = 14,718,991,289.82/139,900.64
6. Step 6: Final answer
   x = 105,210.32