Finding the Fourth Proportional to 131,693.37, 197,152.27 and 81,612.51

Step by Step Solution

1. Step 1: Write the proportion equation
   131,693.37 : 197,152.27 = 81,612.51 : x
2. Step 2: Convert to fraction form
   131,693.37/197,152.27 = 81,612.51/x
3. Step 3: Cross multiply
   131,693.37x = 197,152.27 × 81,612.51
4. Step 4: Simplify right side
   131,693.37x = 16,090,091,606.90
5. Step 5: Solve for x
   x = 16,090,091,606.90/131,693.37
6. Step 6: Final answer
   x = 122,178.45