Finding the Fourth Proportional to 861,408, 1,188,630.72 and 479,450.88

Step by Step Solution

1. Step 1: Write the proportion equation
   861,408 : 1,188,630.72 = 479,450.88 : x
2. Step 2: Convert to fraction form
   861,408/1,188,630.72 = 479,450.88/x
3. Step 3: Cross multiply
   861,408x = 1,188,630.72 × 479,450.88
4. Step 4: Simplify right side
   861,408x = 569,890,044,699.03
5. Step 5: Solve for x
   x = 569,890,044,699.03/861,408
6. Step 6: Final answer
   x = 661,579.70