Finding the Fourth Proportional to 1,100.21, 1,642.46 and 1,061.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.21 : 1,642.46 = 1,061.76 : x
2. Step 2: Convert to fraction form
   1,100.21/1,642.46 = 1,061.76/x
3. Step 3: Cross multiply
   1,100.21x = 1,642.46 × 1,061.76
4. Step 4: Simplify right side
   1,100.21x = 1,743,893.02
5. Step 5: Solve for x
   x = 1,743,893.02/1,100.21
6. Step 6: Final answer
   x = 1,585.06