Finding the Fourth Proportional to 459,019.67, 689,691.98 and 290,619.18

Step by Step Solution

1. Step 1: Write the proportion equation
   459,019.67 : 689,691.98 = 290,619.18 : x
2. Step 2: Convert to fraction form
   459,019.67/689,691.98 = 290,619.18/x
3. Step 3: Cross multiply
   459,019.67x = 689,691.98 × 290,619.18
4. Step 4: Simplify right side
   459,019.67x = 200,437,718,406.72
5. Step 5: Solve for x
   x = 200,437,718,406.72/459,019.67
6. Step 6: Final answer
   x = 436,664.77