Finding the Fourth Proportional to 109,411, 150,912.20 and 66,990.48

Step by Step Solution

1. Step 1: Write the proportion equation
   109,411 : 150,912.20 = 66,990.48 : x
2. Step 2: Convert to fraction form
   109,411/150,912.20 = 66,990.48/x
3. Step 3: Cross multiply
   109,411x = 150,912.20 × 66,990.48
4. Step 4: Simplify right side
   109,411x = 10,109,680,715.86
5. Step 5: Solve for x
   x = 10,109,680,715.86/109,411
6. Step 6: Final answer
   x = 92,400.95