Finding the Fourth Proportional to 406,978.42, 561,665.73 and 237,208.90

Step by Step Solution

1. Step 1: Write the proportion equation
   406,978.42 : 561,665.73 = 237,208.90 : x
2. Step 2: Convert to fraction form
   406,978.42/561,665.73 = 237,208.90/x
3. Step 3: Cross multiply
   406,978.42x = 561,665.73 × 237,208.90
4. Step 4: Simplify right side
   406,978.42x = 133,232,109,981.00
5. Step 5: Solve for x
   x = 133,232,109,981.00/406,978.42
6. Step 6: Final answer
   x = 327,368.98