Finding the Fourth Proportional to 1,780.32, 2,455.92 and 1,116.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.32 : 2,455.92 = 1,116.72 : x
2. Step 2: Convert to fraction form
   1,780.32/2,455.92 = 1,116.72/x
3. Step 3: Cross multiply
   1,780.32x = 2,455.92 × 1,116.72
4. Step 4: Simplify right side
   1,780.32x = 2,742,574.98
5. Step 5: Solve for x
   x = 2,742,574.98/1,780.32
6. Step 6: Final answer
   x = 1,540.50