Finding the Fourth Proportional to 1,978.72, 2,967.86 and 517.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.72 : 2,967.86 = 517.88 : x
2. Step 2: Convert to fraction form
   1,978.72/2,967.86 = 517.88/x
3. Step 3: Cross multiply
   1,978.72x = 2,967.86 × 517.88
4. Step 4: Simplify right side
   1,978.72x = 1,536,995.34
5. Step 5: Solve for x
   x = 1,536,995.34/1,978.72
6. Step 6: Final answer
   x = 776.76