Finding the Fourth Proportional to 645,200.01, 890,380.69 and 403,619.94

Step by Step Solution

1. Step 1: Write the proportion equation
   645,200.01 : 890,380.69 = 403,619.94 : x
2. Step 2: Convert to fraction form
   645,200.01/890,380.69 = 403,619.94/x
3. Step 3: Cross multiply
   645,200.01x = 890,380.69 × 403,619.94
4. Step 4: Simplify right side
   645,200.01x = 359,375,399,665.91
5. Step 5: Solve for x
   x = 359,375,399,665.91/645,200.01
6. Step 6: Final answer
   x = 556,998.44