Finding the Fourth Proportional to 3,131,467.62, 4,321,531.69 and 2,987,978.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131,467.62 : 4,321,531.69 = 2,987,978.55 : x
2. Step 2: Convert to fraction form
   3,131,467.62/4,321,531.69 = 2,987,978.55/x
3. Step 3: Cross multiply
   3,131,467.62x = 4,321,531.69 × 2,987,978.55
4. Step 4: Simplify right side
   3,131,467.62x = 12,912,643,956,317.70
5. Step 5: Solve for x
   x = 12,912,643,956,317.70/3,131,467.62
6. Step 6: Final answer
   x = 4,123,511.89