Finding the Fourth Proportional to 2,987.76, 4,455.30 and 2,779.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.76 : 4,455.30 = 2,779.98 : x
2. Step 2: Convert to fraction form
   2,987.76/4,455.30 = 2,779.98/x
3. Step 3: Cross multiply
   2,987.76x = 4,455.30 × 2,779.98
4. Step 4: Simplify right side
   2,987.76x = 12,385,644.89
5. Step 5: Solve for x
   x = 12,385,644.89/2,987.76
6. Step 6: Final answer
   x = 4,145.46