Finding the Fourth Proportional to 2,678.68, 4,018.86 and 947.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,678.68 : 4,018.86 = 947.32 : x
2. Step 2: Convert to fraction form
   2,678.68/4,018.86 = 947.32/x
3. Step 3: Cross multiply
   2,678.68x = 4,018.86 × 947.32
4. Step 4: Simplify right side
   2,678.68x = 3,807,146.46
5. Step 5: Solve for x
   x = 3,807,146.46/2,678.68
6. Step 6: Final answer
   x = 1,421.28