Finding the Fourth Proportional to 412,978.30, 569,306.82 and 291,905.98

Step by Step Solution

1. Step 1: Write the proportion equation
   412,978.30 : 569,306.82 = 291,905.98 : x
2. Step 2: Convert to fraction form
   412,978.30/569,306.82 = 291,905.98/x
3. Step 3: Cross multiply
   412,978.30x = 569,306.82 × 291,905.98
4. Step 4: Simplify right side
   412,978.30x = 166,184,065,212.78
5. Step 5: Solve for x
   x = 166,184,065,212.78/412,978.30
6. Step 6: Final answer
   x = 402,403.87