Finding the Fourth Proportional to 121,880.72, 168,196.68 and 71,580.56

Step by Step Solution

1. Step 1: Write the proportion equation
   121,880.72 : 168,196.68 = 71,580.56 : x
2. Step 2: Convert to fraction form
   121,880.72/168,196.68 = 71,580.56/x
3. Step 3: Cross multiply
   121,880.72x = 168,196.68 × 71,580.56
4. Step 4: Simplify right side
   121,880.72x = 12,039,612,544.54
5. Step 5: Solve for x
   x = 12,039,612,544.54/121,880.72
6. Step 6: Final answer
   x = 98,781.93