Finding the Fourth Proportional to 1,061.21, 1,591.05 and 713.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.21 : 1,591.05 = 713.69 : x
2. Step 2: Convert to fraction form
   1,061.21/1,591.05 = 713.69/x
3. Step 3: Cross multiply
   1,061.21x = 1,591.05 × 713.69
4. Step 4: Simplify right side
   1,061.21x = 1,135,508.52
5. Step 5: Solve for x
   x = 1,135,508.52/1,061.21
6. Step 6: Final answer
   x = 1,070.01