Finding the Fourth Proportional to 1,099.59, 1,641.52 and 1,061.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.59 : 1,641.52 = 1,061.13 : x
2. Step 2: Convert to fraction form
   1,099.59/1,641.52 = 1,061.13/x
3. Step 3: Cross multiply
   1,099.59x = 1,641.52 × 1,061.13
4. Step 4: Simplify right side
   1,099.59x = 1,741,866.12
5. Step 5: Solve for x
   x = 1,741,866.12/1,099.59
6. Step 6: Final answer
   x = 1,584.11