Finding the Fourth Proportional to 120,613, 181,123.62 and 78,564.28

Step by Step Solution

1. Step 1: Write the proportion equation
   120,613 : 181,123.62 = 78,564.28 : x
2. Step 2: Convert to fraction form
   120,613/181,123.62 = 78,564.28/x
3. Step 3: Cross multiply
   120,613x = 181,123.62 × 78,564.28
4. Step 4: Simplify right side
   120,613x = 14,229,846,796.29
5. Step 5: Solve for x
   x = 14,229,846,796.29/120,613
6. Step 6: Final answer
   x = 117,979.38