Finding the Fourth Proportional to 421,705.42, 582,046.89 and 291,066.49

Step by Step Solution

1. Step 1: Write the proportion equation
   421,705.42 : 582,046.89 = 291,066.49 : x
2. Step 2: Convert to fraction form
   421,705.42/582,046.89 = 291,066.49/x
3. Step 3: Cross multiply
   421,705.42x = 582,046.89 × 291,066.49
4. Step 4: Simplify right side
   421,705.42x = 169,414,345,287.72
5. Step 5: Solve for x
   x = 169,414,345,287.72/421,705.42
6. Step 6: Final answer
   x = 401,736.23