Finding the Fourth Proportional to 139,505.34, 209,263.50 and 72,900.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139,505.34 : 209,263.50 = 72,900.24 : x
2. Step 2: Convert to fraction form
   139,505.34/209,263.50 = 72,900.24/x
3. Step 3: Cross multiply
   139,505.34x = 209,263.50 × 72,900.24
4. Step 4: Simplify right side
   139,505.34x = 15,255,359,373.24
5. Step 5: Solve for x
   x = 15,255,359,373.24/139,505.34
6. Step 6: Final answer
   x = 109,353.23