Finding the Fourth Proportional to 487,096,611.92, 672,290,978.42 and 288,968,080.67

Step by Step Solution

1. Step 1: Write the proportion equation
   487,096,611.92 : 672,290,978.42 = 288,968,080.67 : x
2. Step 2: Convert to fraction form
   487,096,611.92/672,290,978.42 = 288,968,080.67/x
3. Step 3: Cross multiply
   487,096,611.92x = 672,290,978.42 × 288,968,080.67
4. Step 4: Simplify right side
   487,096,611.92x = 194,270,633,685,665,856
5. Step 5: Solve for x
   x = 194,270,633,685,665,856/487,096,611.92
6. Step 6: Final answer
   x = 398,833,884.15