Finding the Fourth Proportional to 140,081.78, 193,313.31 and 76,420.91

Step by Step Solution

1. Step 1: Write the proportion equation
   140,081.78 : 193,313.31 = 76,420.91 : x
2. Step 2: Convert to fraction form
   140,081.78/193,313.31 = 76,420.91/x
3. Step 3: Cross multiply
   140,081.78x = 193,313.31 × 76,420.91
4. Step 4: Simplify right side
   140,081.78x = 14,773,179,065.31
5. Step 5: Solve for x
   x = 14,773,179,065.31/140,081.78
6. Step 6: Final answer
   x = 105,461.10