Finding the Fourth Proportional to 1,987.46, 2,978.01 and 1,677.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.46 : 2,978.01 = 1,677.86 : x
2. Step 2: Convert to fraction form
   1,987.46/2,978.01 = 1,677.86/x
3. Step 3: Cross multiply
   1,987.46x = 2,978.01 × 1,677.86
4. Step 4: Simplify right side
   1,987.46x = 4,996,683.86
5. Step 5: Solve for x
   x = 4,996,683.86/1,987.46
6. Step 6: Final answer
   x = 2,514.11