Finding the Fourth Proportional to 139,303.50, 192,238.83 and 79,687.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,303.50 : 192,238.83 = 79,687.50 : x
2. Step 2: Convert to fraction form
   139,303.50/192,238.83 = 79,687.50/x
3. Step 3: Cross multiply
   139,303.50x = 192,238.83 × 79,687.50
4. Step 4: Simplify right side
   139,303.50x = 15,319,031,765.63
5. Step 5: Solve for x
   x = 15,319,031,765.63/139,303.50
6. Step 6: Final answer
   x = 109,968.75