Finding the Fourth Proportional to 120,276.09, 180,553.89 and 70,391.98

Step by Step Solution

1. Step 1: Write the proportion equation
   120,276.09 : 180,553.89 = 70,391.98 : x
2. Step 2: Convert to fraction form
   120,276.09/180,553.89 = 70,391.98/x
3. Step 3: Cross multiply
   120,276.09x = 180,553.89 × 70,391.98
4. Step 4: Simplify right side
   120,276.09x = 12,709,546,303.46
5. Step 5: Solve for x
   x = 12,709,546,303.46/120,276.09
6. Step 6: Final answer
   x = 105,669.77