Finding the Fourth Proportional to 1,219.32, 1,681.56 and 1,089.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,219.32 : 1,681.56 = 1,089.72 : x
2. Step 2: Convert to fraction form
   1,219.32/1,681.56 = 1,089.72/x
3. Step 3: Cross multiply
   1,219.32x = 1,681.56 × 1,089.72
4. Step 4: Simplify right side
   1,219.32x = 1,832,429.56
5. Step 5: Solve for x
   x = 1,832,429.56/1,219.32
6. Step 6: Final answer
   x = 1,502.83