Finding the Fourth Proportional to 139,125, 191,992.50 and 79,509

Step by Step Solution

1. Step 1: Write the proportion equation
   139,125 : 191,992.50 = 79,509 : x
2. Step 2: Convert to fraction form
   139,125/191,992.50 = 79,509/x
3. Step 3: Cross multiply
   139,125x = 191,992.50 × 79,509
4. Step 4: Simplify right side
   139,125x = 15,265,131,682.50
5. Step 5: Solve for x
   x = 15,265,131,682.50/139,125
6. Step 6: Final answer
   x = 109,722.42