Finding the Fourth Proportional to 1,492.72, 2,238.55 and 518.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,492.72 : 2,238.55 = 518.61 : x
2. Step 2: Convert to fraction form
   1,492.72/2,238.55 = 518.61/x
3. Step 3: Cross multiply
   1,492.72x = 2,238.55 × 518.61
4. Step 4: Simplify right side
   1,492.72x = 1,160,934.42
5. Step 5: Solve for x
   x = 1,160,934.42/1,492.72
6. Step 6: Final answer
   x = 777.73