Finding the Fourth Proportional to 1,070.34, 1,601.27 and 811.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,070.34 : 1,601.27 = 811.10 : x
2. Step 2: Convert to fraction form
   1,070.34/1,601.27 = 811.10/x
3. Step 3: Cross multiply
   1,070.34x = 1,601.27 × 811.10
4. Step 4: Simplify right side
   1,070.34x = 1,298,778.04
5. Step 5: Solve for x
   x = 1,298,778.04/1,070.34
6. Step 6: Final answer
   x = 1,213.43