Finding the Fourth Proportional to 1,474.15, 2,212.17 and 780.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,474.15 : 2,212.17 = 780.52 : x
2. Step 2: Convert to fraction form
   1,474.15/2,212.17 = 780.52/x
3. Step 3: Cross multiply
   1,474.15x = 2,212.17 × 780.52
4. Step 4: Simplify right side
   1,474.15x = 1,726,642.93
5. Step 5: Solve for x
   x = 1,726,642.93/1,474.15
6. Step 6: Final answer
   x = 1,171.28