Finding the Fourth Proportional to 639,131.16, 881,878.08 and 384,498.72

Step by Step Solution

1. Step 1: Write the proportion equation
   639,131.16 : 881,878.08 = 384,498.72 : x
2. Step 2: Convert to fraction form
   639,131.16/881,878.08 = 384,498.72/x
3. Step 3: Cross multiply
   639,131.16x = 881,878.08 × 384,498.72
4. Step 4: Simplify right side
   639,131.16x = 339,080,992,956.06
5. Step 5: Solve for x
   x = 339,080,992,956.06/639,131.16
6. Step 6: Final answer
   x = 530,534.28