Finding the Fourth Proportional to 139,980.50, 209,991.90 and 45,179

Step by Step Solution

1. Step 1: Write the proportion equation
   139,980.50 : 209,991.90 = 45,179 : x
2. Step 2: Convert to fraction form
   139,980.50/209,991.90 = 45,179/x
3. Step 3: Cross multiply
   139,980.50x = 209,991.90 × 45,179
4. Step 4: Simplify right side
   139,980.50x = 9,487,224,050.10
5. Step 5: Solve for x
   x = 9,487,224,050.10/139,980.50
6. Step 6: Final answer
   x = 67,775.33