Finding the Fourth Proportional to 1,978.68, 2,731.95 and 1,316.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.68 : 2,731.95 = 1,316.91 : x
2. Step 2: Convert to fraction form
   1,978.68/2,731.95 = 1,316.91/x
3. Step 3: Cross multiply
   1,978.68x = 2,731.95 × 1,316.91
4. Step 4: Simplify right side
   1,978.68x = 3,597,732.27
5. Step 5: Solve for x
   x = 3,597,732.27/1,978.68
6. Step 6: Final answer
   x = 1,818.25