Finding the Fourth Proportional to 80,131.72, 120,196.86 and 56,341.12

Step by Step Solution

1. Step 1: Write the proportion equation
   80,131.72 : 120,196.86 = 56,341.12 : x
2. Step 2: Convert to fraction form
   80,131.72/120,196.86 = 56,341.12/x
3. Step 3: Cross multiply
   80,131.72x = 120,196.86 × 56,341.12
4. Step 4: Simplify right side
   80,131.72x = 6,772,025,712.88
5. Step 5: Solve for x
   x = 6,772,025,712.88/80,131.72
6. Step 6: Final answer
   x = 84,511.17