Finding the Fourth Proportional to 1,099.70, 1,641.72 and 1,061.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.70 : 1,641.72 = 1,061.26 : x
2. Step 2: Convert to fraction form
   1,099.70/1,641.72 = 1,061.26/x
3. Step 3: Cross multiply
   1,099.70x = 1,641.72 × 1,061.26
4. Step 4: Simplify right side
   1,099.70x = 1,742,291.77
5. Step 5: Solve for x
   x = 1,742,291.77/1,099.70
6. Step 6: Final answer
   x = 1,584.33