Finding the Fourth Proportional to 1,061.90, 1,591.94 and 830.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.90 : 1,591.94 = 830.07 : x
2. Step 2: Convert to fraction form
   1,061.90/1,591.94 = 830.07/x
3. Step 3: Cross multiply
   1,061.90x = 1,591.94 × 830.07
4. Step 4: Simplify right side
   1,061.90x = 1,321,417.49
5. Step 5: Solve for x
   x = 1,321,417.49/1,061.90
6. Step 6: Final answer
   x = 1,244.40