Finding the Fourth Proportional to 1,555.12, 2,331.80 and 1,422.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.12 : 2,331.80 = 1,422.72 : x
2. Step 2: Convert to fraction form
   1,555.12/2,331.80 = 1,422.72/x
3. Step 3: Cross multiply
   1,555.12x = 2,331.80 × 1,422.72
4. Step 4: Simplify right side
   1,555.12x = 3,317,498.50
5. Step 5: Solve for x
   x = 3,317,498.50/1,555.12
6. Step 6: Final answer
   x = 2,133.27