Finding the Fourth Proportional to 2,118.91, 3,178.98 and 948.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.91 : 3,178.98 = 948.65 : x
2. Step 2: Convert to fraction form
   2,118.91/3,178.98 = 948.65/x
3. Step 3: Cross multiply
   2,118.91x = 3,178.98 × 948.65
4. Step 4: Simplify right side
   2,118.91x = 3,015,731.43
5. Step 5: Solve for x
   x = 3,015,731.43/2,118.91
6. Step 6: Final answer
   x = 1,423.25