Finding the Fourth Proportional to 290,535.18, 436,619.25 and 172,223.34

Step by Step Solution

1. Step 1: Write the proportion equation
   290,535.18 : 436,619.25 = 172,223.34 : x
2. Step 2: Convert to fraction form
   290,535.18/436,619.25 = 172,223.34/x
3. Step 3: Cross multiply
   290,535.18x = 436,619.25 × 172,223.34
4. Step 4: Simplify right side
   290,535.18x = 75,196,025,543.30
5. Step 5: Solve for x
   x = 75,196,025,543.30/290,535.18
6. Step 6: Final answer
   x = 258,819.00