Finding the Fourth Proportional to 409,870.50, 565,722.69 and 279,264.18

Step by Step Solution

1. Step 1: Write the proportion equation
   409,870.50 : 565,722.69 = 279,264.18 : x
2. Step 2: Convert to fraction form
   409,870.50/565,722.69 = 279,264.18/x
3. Step 3: Cross multiply
   409,870.50x = 565,722.69 × 279,264.18
4. Step 4: Simplify right side
   409,870.50x = 157,986,085,018.75
5. Step 5: Solve for x
   x = 157,986,085,018.75/409,870.50
6. Step 6: Final answer
   x = 385,453.66