Finding the Fourth Proportional to 288,066.42, 431,520.89 and 143,536.30

Step by Step Solution

1. Step 1: Write the proportion equation
   288,066.42 : 431,520.89 = 143,536.30 : x
2. Step 2: Convert to fraction form
   288,066.42/431,520.89 = 143,536.30/x
3. Step 3: Cross multiply
   288,066.42x = 431,520.89 × 143,536.30
4. Step 4: Simplify right side
   288,066.42x = 61,938,910,126.82
5. Step 5: Solve for x
   x = 61,938,910,126.82/288,066.42
6. Step 6: Final answer
   x = 215,016.07