Finding the Fourth Proportional to 429,480.05, 644,113.59 and 145,164.27

Step by Step Solution

1. Step 1: Write the proportion equation
   429,480.05 : 644,113.59 = 145,164.27 : x
2. Step 2: Convert to fraction form
   429,480.05/644,113.59 = 145,164.27/x
3. Step 3: Cross multiply
   429,480.05x = 644,113.59 × 145,164.27
4. Step 4: Simplify right side
   429,480.05x = 93,502,279,089.43
5. Step 5: Solve for x
   x = 93,502,279,089.43/429,480.05
6. Step 6: Final answer
   x = 217,710.42