Finding the Fourth Proportional to 1,554.56, 2,328.72 and 772.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.56 : 2,328.72 = 772.20 : x
2. Step 2: Convert to fraction form
   1,554.56/2,328.72 = 772.20/x
3. Step 3: Cross multiply
   1,554.56x = 2,328.72 × 772.20
4. Step 4: Simplify right side
   1,554.56x = 1,798,226.92
5. Step 5: Solve for x
   x = 1,798,226.92/1,554.56
6. Step 6: Final answer
   x = 1,156.74