Finding the Fourth Proportional to 2,978.67, 4,445.50 and 2,900.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.67 : 4,445.50 = 2,900.91 : x
2. Step 2: Convert to fraction form
   2,978.67/4,445.50 = 2,900.91/x
3. Step 3: Cross multiply
   2,978.67x = 4,445.50 × 2,900.91
4. Step 4: Simplify right side
   2,978.67x = 12,895,988.15
5. Step 5: Solve for x
   x = 12,895,988.15/2,978.67
6. Step 6: Final answer
   x = 4,329.45